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Security  >   >  Security Sensors

Security Sensors

165 products found

Security sensors are essential devices that alert you of any potentially dangerous conditions in your home. If you have difficulties installing one, here are tips on how to place sensors. You can also check out the latest sensors in Hong Kong below!

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JINMANZE High Quality Wireless Home Security Door Window sensor for Alarm System Magnetic Sensor 5pcs free shipping
HK$ 145.00
AliExpress
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Free shipping NEW 3PCS PIR Door magnetic sensor for remote control Wireless home security alarm PSTN& GSM alarm system 433MHz
HK$ 496.00
AliExpress
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105dB Door Window Wireless Burglar Alarm with Magnetic Sensor Home Safety Wireless Longer System Security Device with LED
HK$ 34.00
AliExpress
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(1 pair) Magnetic Sensor switch Detector Home Office Door Window Open Alarm Entry Anti burglar Alarm System without battery
HK$ 38.00
AliExpress
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SmartYIBA 433Mhz Wireless Home Window Door Alarm Door Gap Alarm Detector Magnetic Sensor for Home Security Alarm System
HK$ 44.00
AliExpress
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SmartYIBA Wireless WIFI House 3G Alarm system With 2pcs Surveillance Cameras Motion Alarm Siren Alert Door Magnetic Sensor Kits
HK$ 1,942.00
AliExpress
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15pcs/lot 433MHz Sensor Intelligent Wireless Door Magnetic Sensor Door Gap Window Sensors Detectors For our Alarm System
HK$ 423.00
AliExpress
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Doberman Security SE-0162 100dB Wireless Magnetic Sensor Triggered Door and Window Alarm Smart Home Security Alarm System
HK$ 59.00
AliExpress
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Free shipping 5pcs Home & office doors/windows anti-theft detector alarm anti-entry Door magnetic sensor burglar alarm
HK$ 75.00
AliExpress
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Wireless Sensor door detector,magnetic contact,door contact 433mhz for home security alarm system Wireless Door Magnetic Sensor
HK$ 193.00
AliExpress
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Gate/Door Alarm Sensor Wireless Remote Control Door Alarm door sensor alarm magnetic sensor alarm
HK$ 94.00
AliExpress
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20pcs/lot 12V 3A automatic magnetic sensor switch for led bar light led flexible strip etc for door wardrobe using
HK$ 906.00
AliExpress
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SmartYIBA RFID Wireless GSM&SMS Burglar Alarm Security System APP Control Motion Sensor Door Magnetic Sensor Strobe Siren Alarm
HK$ 758.00
AliExpress

SmartYIBA RFID Wireless GSM&SMS Burglar Alarm Security System APP Control Motion Sensor Door Magnetic Sensor Strobe Siren Alarm

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Golden Security Code EV1527 433MHz Wireless Door Magnetic Sensor detector for Camera KERUI All Series Home security alarm system
HK$ 40.00
AliExpress
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Golden Security Wireless Door Window Magnetic Sensor for G90B WiFi GSM Home Wireless Alarm System Security
HK$ 45.00
AliExpress
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10pcs Wired Door Window Magnetic Sensor Switch Work With PTSN and GSM Alarm System
HK$ 73.00
AliExpress
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OKEEN 2pcs car-styling car door warning light open signal flashing light wireless Magnetic sensor led door logo projection light
HK$ 104.00
AliExpress
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1 Sets Magnetic Sensor Wireless Alarm System Door Window Motion Burglar Entry Security Home Guarding 105dB
HK$ 34.00
AliExpress
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Wireless Magnetic Sensor House Window Door Motion Detector Alarm System Security Home Guarding
HK$ 52.00
Tomtop

Features: *Wireless magnetic sensors of door/window security alarm, it will alarm when the sensor detects someone comes in or there is some vibration of the door or window. *Built-in 108dB loud alarm, can effectively frighten the thieves. *Four alarm modes optional: alarm mode, constant alarm mode, closing-door alert and doorbell mode. *The host installation with double-side adhesive, it is easier to install. *Compact small size, creative design and low-consumption, which makes it can work long time.

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wireless door magnetic sensor detector for home GSM alarm system free shipping
HK$ 131.00
AliExpress
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5pcs/Lot Wired Door Window Magnetic Sensor Switch Work With PTSN And GSM Wired Alarm System Door Window Gap Detector
HK$ 38.00
AliExpress
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5 * Wireless 433MHz Home Security Door Window Entry Alarm Warning System Magnetic Sensor Alarm
HK$ 71.00
Tomtop

Features: * High Sensitivity. * With dual function of emergency switch magnetic door. * Low consumption chip design. * Low voltage fault monitoring reports. * 1527 IC, oscillation resistance optional.

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Tanbaby led stair light PIR motion sensor infrared human body induction Led wall step lamp white warm emergency night light
HK$ 94.00
AliExpress
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Yobang Security APP Control Network IP Camera Surveillance WIFI GSM Alarma Mini Smart PIR/Door Magnetic Sensor Smoke Alarm Kits
HK$ 1,082.00
AliExpress
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Saful Wireless Home Door Window Burglar DIY Safety Security Alarm System Magnetic Sensor Remote Control alarm system
HK$ 64.00
AliExpress
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Self-adhesive Wireless Magnetic Sensor Burglar Door Window Entry Alarm Super Loud 90 dB Alarm With Stick Dustproof
HK$ 36.00
AliExpress
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433mhz Wireless door magnetic sensor alarm Alarm Security Accessory window entry sensor magnetic sensor alarm 315mhz w/ battery
HK$ 47.00
AliExpress
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leshp Wireless Door Magnetic Sensor Detector Alarm for 315/433MHz Home Security Emergency Help Ultra-low Power Microprocessor
HK$ 44.00
AliExpress
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5Pcs GY-271 HMC5883L Digital Compass Module 3-Axis Magnetic Sensor Module
HK$ 94.00
Newfrog

5Pcs Gy-271 Hmc5883L Digital Compass Module 3-Axis Magnetic Sensor Module

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Big discount ES-D3C 433Mhz Etiger Wireless door magnetic sensor window door sensor for S4 and V2 Wifi GSM alarm system
HK$ 94.00
AliExpress
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Wireless Door Contact sensor, Door Magnetic Sensor King Pigeon DM-100C
HK$ 40.00
AliExpress
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RAYKUBE Welcome Door Bell Motion Sensor Warning Doorbell Standalone Infrared Sensor Alarm R-818
HK$ 71.00
AliExpress
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Electronic Magnetic Sensor Relay Module w Rectangle Reed Door Contact Switch
HK$ 88.00
AliExpress
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Wireless Remote Control Alarm magnetic Sensor Door Window Car Home House Security Sensor Detector magnet alarm no packing box
HK$ 79.00
AliExpress
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1 pair Metal wired magnetic sensor for door or window security alarm system Rolling Gate alarm support garage store
HK$ 71.00
AliExpress
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SmartYIBA GSM Home Intelligent Burglar Alarm System Wireless SMS Alarm Kits PIR Motion Detector Window Door Magnetic Sensor
HK$ 686.00
AliExpress

SmartYIBA GSM Home Intelligent Burglar Alarm System Wireless SMS Alarm Kits PIR Motion Detector Window Door Magnetic Sensor

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4pcs Intelligent Wireless Door Gap Window Sensor Detector 433MHz door magnet magnetic sensor contact For KERUI Alarm Systems
HK$ 149.00
AliExpress
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Remote Control Alarm Security Door Window Timely Burglar Home Siren Magnetic Sensor Warning System Door Window Detector
HK$ 168.00
AliExpress
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Door Window Wireless Burglar Alarm with Magnetic Sensor Home Safety Wireless Longer System Security Device 90dB White Wholesale
HK$ 18.00
AliExpress
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LumiParty LED PIR Smart LED Lighting Motion Sensor Ceiling Lamp led bulb with motion sensor Infrared Body Sensor Night Lamp E27
HK$ 78.00
AliExpress
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5V Electronic Magnetic Sensor Relay Module w Rectangle Reed Door Contact Switch
HK$ 88.00
AliExpress
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Wireless Home Security window/door magnetic sensor open detector 1527 chips for wireless alarm system
HK$ 45.00
AliExpress
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Forecum® Wireless Remote Control Magnetic Sensor Fashion Remote Control Home House Door Window Detector Security Alarm
HK$ 142.00
Tomtop

Features: *One magnetic sensor can match with at most 8 remote controllers freely *One remote controller could control several magnetic sensors *Alarmanddoorbellfunctionforyouroption *Low-consumptiondesign,which makes it can work long time *Installation with double-side adhesive,easier to install *Remote control operation makes it easy to operate *Excellentdesign,tinyandfashion *Built-in 110dB loud alarm, can effectively frighten the thieves *It has the function of arm,disarm,emergency alarm and door bell

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Wireless Smart Home Door Windows Anti-Theft Magnetic Sensor Detector
HK$ 35.00
Newfrog

Wireless Smart Home Door Windows Anti-Theft Magnetic Sensor Detector

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SmartYIBA Wireless GSM Alarm System Auto Dial Security Alarm Kits Motion Detection Door Magnetic Sensor Wireless Burglar Alarma
HK$ 613.00
AliExpress
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FANUC spindle positioning amplifier Magnetic SENSOR A57L-0001-0037 A57L00010037 BKO-C1810-H01 BKO-C1730H01
HK$ 871.00
AliExpress
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3.5-inch 160 degree PIR motion sensor infrared night vision wireless peephole doorbell, motion detection + 2 million pixels
HK$ 371.00
AliExpress
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Wireless Home Window Door Burglar Security Alarm System Magnetic Sensor
HK$ 33.00
Newfrog

Wireless Home Window Door Burglar Security Alarm System Magnetic Sensor

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KST MS589 Mini Metal Gear Magnetic Sensor Digital Servo - 500 Size
HK$ 667.00
AliExpress
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High Quality Wireless Home Security Door Window Entry Alarm warning System Magnetic Sensor 1pcs Free Shipping
HK$ 44.00
AliExpress
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free shipping Wireless Home Door Window Burglar DIY Safety Security ALARM System Magnetic Sensor Remote Control
HK$ 98.00
AliExpress
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Shop Home Hotel Vistor Entry Bell Welcome Chime Alarm Music Switch PIR Motion Sensor Infrared Detector Sensor
HK$ 62.00
AliExpress
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A57L-0001-0037 Spindle positioning amplifier GE Fanuc Magnetic Sensor Spindle positioner
HK$ 1,256.00
AliExpress
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Wireless Door Magnetic Sensor Detector Window Door Entry Anti Thief Burglar Alarm 433Mhz Home Wireless Security Alarm System
HK$ 40.00
AliExpress
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2pcs Free Shipping CS1-J Red LED Pneumatic Cylinder Magnetic Sensor Reed Switch ,DC AC 5V - 120V
HK$ 45.00
AliExpress
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Free shipping Wireless window and door magnetic sensor open detector 2262 chips
HK$ 45.00
AliExpress
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Techage Wireless PIR Motion Sensor Infrared Alarm Detector For Wifi GSM Home Burglar Alarm System Security Kit Built-in Battery
HK$ 71.00
AliExpress
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Wireless Chime Alarm Alert Doorbell with PIR Motion Sensor Infrared Detector Induction Gate Entry Door Bell for Home F9506B
HK$ 115.00
AliExpress
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Free shipping plastic wired magnetic sensor for door or window normal close for your security alarm system wired
HK$ 204.00
AliExpress
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(1 PCS)Indoor 360 degree ceiling Motion sensor infrared and microwave Double sensor Wired burglar alarm NC NO signal output
HK$ 155.00
AliExpress
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Free Shipping MBT3560 084Z4030 084Z4035 084Z4069 084Z4070 Temperature Sensor Magnetic Sensor Capacitance Resistance Sensor
HK$ 1,767.00
AliExpress
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Wireless Home Door Window Entry Sensor Burglar Theft Security Alarm System Magnetic Sensor 433Mhz Gate Magnetic Contact DM-100C
HK$ 73.00
AliExpress
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Yobang Security Wireless Home Security WIFI GPRS 3G Alarm System APP Control Network Camera Mini Door Magnetic Sensor Alarm Kits
HK$ 757.00
AliExpress

Yobang Security Wireless Home Security WIFI GPRS 3G Alarm System APP Control Network Camera Mini Door Magnetic Sensor Alarm Kits

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Wireless 433MHz Window Door Magnetic Sensor Alarm Entry Warning System for Home Security (10 pack)
HK$ 259.00
Tomtop

Features: *Wireless 433MHz window door magnetic sensor, it includes one transmitter part and one magnetic part, with the function of detecting door or window's opening or closing. *Monitoring and security system with high reliability, it will be triggered and immediately sends out wireless signal to main alarm system for warning when the door or window is open. *Low power consumption, save power design, high-performance. *Super design with small size, strong flexibility. *Easy installation and high sensitivity.

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Original new 100% hot spot magnetic sensor MK5117 quality assurance (SWITCH)
HK$ 793.00
AliExpress
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New Wireless Extra Door Window Magnetic Sensor for Home Security Voice Burglar PSTN GSM Alarm System Battery Included
HK$ 89.00
AliExpress
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2-12M 360 Degree PIR Ceiling Occupancy Motion Sensor Infrared Induction Light Dls HOmeful
HK$ 78.00
AliExpress
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SMARSECUR Home Security Door Window Magnetic Sensor Alarm Warning System Wireless Remote Control Door Detector Burglar Alarm
HK$ 141.00
AliExpress
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YobangSecurity Android IOS APP WiFi GSM Home Security Alarm System Door Magnetic Sensor Wireless Motion Detector Wired Siren
HK$ 1,085.00
AliExpress
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Fuers Wireless Alarm Pet Sensor Smart Anti Pet Detector Motion Magnetic Sensor For G90B/G18/G19/W18 Gsm Home Alarm System
HK$ 108.00
AliExpress
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LPSECURITY Security Standalone Truck Tool Box Alarm with Remote Control/car vehicle window door gate alarm magnetic sensor
HK$ 134.00
AliExpress
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Wireless 433MHz Window Door Magnetic Sensor
HK$ 46.00
Tomtop

Features: *Wireless 433MHz window door magnetic sensor, it includes one transmitter part and one magnetic part, with the function of detecting door or window's opening or closing. *Monitoring and security system with high reliability, it will be triggered and immediately sends out wireless signal to main alarm system for warning when the door or window is open. *Low power consumption, save power design, high-performance. *Super design with small size, strong flexibility. *Easy installation and high sensitivity.

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Self-adhesive Wireless Magnetic Sensor Home Door Window Entry Burglar Security Alarm Safety Guardian Protector System White New
HK$ 36.00
AliExpress
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Hot Sale Extra Door&window Magnetic Sensor Detector for Wireless PSTN GSM Security Home Alarm System 433MHz with Battery
HK$ 35.00
AliExpress
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SmartYIBA WIFI Wireless Home Alarm Security System HD Smart Camera Door Window Burglar MINI Magnetic Sensor Motion Alarm
HK$ 1,154.00
AliExpress
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10pcs/lot Wired Door Window Magnetic Sensor Switch Work With PTSN and GSM Alarm System Wired zone KERUI 8218G G19 Q2 GSM10A
HK$ 78.00
AliExpress
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Wireless Anti-Theft Remote Control Window Door Security Alarm System Magnetic Sensor Door Window Home Security Burglar Alarm
HK$ 75.00
AliExpress
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Big discount 10PCS Wireless Etiger ES-D3C door magnetic sensor window door sensor for S4 and V2 Wifi GSM alarm system
HK$ 856.00
AliExpress
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5pcs/lot AC85-220V N.O type Wired Door Window Magnetic Sensor Switch Work With PTSN and GSM Alarm System and cabinet
HK$ 187.00
AliExpress
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BNO055 CJMCU-055 Intelligent 9-Axis Attitude Sensor precision Accelerometer gyroscope magnetic sensor module for arduino
HK$ 87.00
AliExpress
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SmartYIBA Wireless GSM Burglar Intruder Alarm System Intelligent Alarm Voice Prompt Alarm Kits Wireless Door Magnetic Sensor
HK$ 701.00
AliExpress

SmartYIBA Wireless GSM Burglar Intruder Alarm System Intelligent Alarm Voice Prompt Alarm Kits Wireless Door Magnetic Sensor

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Wireless 433MHz Window Door Magnetic Sensor Alarm Entry Warning System for Home Security (10 pack)
HK$ 215.00
Tomtop

Features: *Wireless 433MHz window door magnetic sensor, it includes one transmitter part and one magnetic part, with the function of detecting door or window's opening or closing. *Monitoring and security system with high reliability, it will be triggered and immediately sends out wireless signal to main alarm system for warning when the door or window is open. *Low power consumption, save power design, high-performance. *Super design with small size, strong flexibility. *Easy installation and high sensitivity.

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SmartYIBA 433Mhz Wireless Door Window Sensor Door Open Detection Alarm Door Magnetic Sensor For YB103/YB104 Alarm System
HK$ 41.00
AliExpress
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HomE Security Door Window Siren Magnetic Sensor Alarm Warning System Wireless Remote Control Door Detector Burglar Alarm
HK$ 75.00
AliExpress
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Free shipping Wireless Home Security window/door magnetic sensor open detector 1527 chips for wireless alarm system
HK$ 45.00
AliExpress
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Wireless Windows Sensor Magnetic Sensor From Another Part Of Build Which Is Accessible From The Ground Such As A Garage DM-100A
HK$ 78.00
AliExpress
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5pcs/lot AC85-240V Normally close type Proximity Magnetic Sensor / Reed Switch
HK$ 187.00
AliExpress
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Fuers 3pcs/lot Wireless Door Magnetic Sensor Detector For Touch Keypad Panel GSM PSTN Home Security Burglar Voice Alarm System
HK$ 124.00
AliExpress
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TIVDIO Wireless Chime Alarm Alert Doorbell with PIR Motion Sensor Infrared Detector Induction Gate Entry Door Bell Home F9506B
HK$ 113.00
AliExpress
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10X WIRELESS Home Window Door Burglar Security ALARM System Magnetic Sensor
HK$ 111.00
Newfrog

10X Wireless Home Window Door Burglar Security Alarm System Magnetic Sensor

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Wireless Door Contact sensor, Door Magnetic Sensor King Pigeon DM-100C
HK$ 40.00
AliExpress
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Saful Door Magnetic Sensor 3pcs Home Window Security Burglar Alarm Device Good Quanlity
HK$ 61.00
AliExpress
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D-C73 LED Light Pneumatic Air Cylinder Magnetic Sensor Switch Replacement
HK$ 69.00
AliExpress
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SE-0309 Direct Factory Wired Door Window Magnetic Sensor Switch Work With PTSN And GSM Alarm System
HK$ 147.00
AliExpress
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door sensor burglar alarm,remote control function wireless door magnetic sensor anti-theft alarm wireless sensor alarm
HK$ 105.00
AliExpress
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6pcs/lot Intelligent Wireless Door Magnetic Sensor Door Gap Window Sensors Detectors 433MHz For our Alarm System
HK$ 191.00
AliExpress
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(10 pairs)Wireless Magnetic Sensor 1527 433MHz Door Window open Detector For GSM Alarm system anti-burglar Without battery
HK$ 359.00
AliExpress
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Self-adhesive Wireless Magnetic Sensor Burglar Door Window Entry Alarm Super Loud 90 dB Alarm With Stick Dustproof
HK$ 34.00
AliExpress
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1PCS GY-271 HMC5883L Digital Compass Module 3-Axis Magnetic Sensor Module 14*13*4mm.
HK$ 28.00
Newfrog

1Pcs Gy-271 Hmc5883L Digital Compass Module 3-Axis Magnetic Sensor Module 14*13*4mm.

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3308W Shutter doors alarm roll gate alarm remote control wireless alarm warehouse garage shop burglar alarm door magnetic sensor
HK$ 166.00
AliExpress

Top Security Sensors Price List 2018

Top 10 products Price Store
JINMANZE High Quality Wireless Home Security Door Window sensor for Alarm System Magnetic Sensor 5pcs free shipping HK$ 145.00 AliExpress
Free shipping NEW 3PCS PIR Door magnetic sensor for remote control Wireless home security alarm PSTN& GSM alarm system 433MHz HK$ 496.00 AliExpress
105dB Door Window Wireless Burglar Alarm with Magnetic Sensor Home Safety Wireless Longer System Security Device with LED HK$ 34.00 AliExpress
(1 pair) Magnetic Sensor switch Detector Home Office Door Window Open Alarm Entry Anti burglar Alarm System without battery HK$ 38.00 AliExpress
SmartYIBA 433Mhz Wireless Home Window Door Alarm Door Gap Alarm Detector Magnetic Sensor for Home Security Alarm System HK$ 44.00 AliExpress
SmartYIBA Wireless WIFI House 3G Alarm system With 2pcs Surveillance Cameras Motion Alarm Siren Alert Door Magnetic Sensor Kits HK$ 1,942.00 AliExpress
15pcs/lot 433MHz Sensor Intelligent Wireless Door Magnetic Sensor Door Gap Window Sensors Detectors For our Alarm System HK$ 423.00 AliExpress
Doberman Security SE-0162 100dB Wireless Magnetic Sensor Triggered Door and Window Alarm Smart Home Security Alarm System HK$ 59.00 AliExpress
Free shipping 5pcs Home & office doors/windows anti-theft detector alarm anti-entry Door magnetic sensor burglar alarm HK$ 75.00 AliExpress
Wireless Sensor door detector,magnetic contact,door contact 433mhz for home security alarm system Wireless Door Magnetic Sensor HK$ 193.00 AliExpress

How to Install Security Sensors in Hong Kong

Installing sensors isn’t a difficult task, it’s as easy as peeling a sticker and placing it on any surface. But doing so requires planning to look for the right place for each sensor, ensuring that it will work effectively as possible. Here are some installation tips on how to determine the perfect place for different types of sensors.

Carbon Monoxide Detectors

Carbon monoxide detectors in Hong Kong beep loudly if there are high levels of carbon monoxide in the air, alerting you to get everyone out of the house. It’s best to install one carbon monoxide detector on each floor of your home and place it five feet above the ground. When it comes to good locations for installing these sensors, you can place them near bedrooms and in living rooms where most people are likely sleeping or gathering. You can also place one near your garage door but avoid installing it inside the garage, close to any appliances, or in confined places like furnace rooms.

Door/window sensors

Door sensors in Hong Kong alert you once a burglar enters your home through a door or window. They send a signal to the control panel which notifies the central monitoring station. It’s best to have these sensors on every door and window, but you might also want to consider purchasing a glass break sensor or image sensor instead of multiple window sensor. If one of your doors or windows appears to be an easy spot for burglars to access, then make sure you place a sensor near it. Intruders like dark areas, so you may want to have those places monitored. Also, don’t forget to install sensors near your bedroom windows.

Fire/heat/smoke detectors

This kind of sensors detects fire, heat, and smoke. When installing these sensors, make sure they are interconnected so that they will alert in unison, making sure that everyone in the house will hear them. It’s best to have at least one fire alarm on every floor of your home, especially in places where people gather or sleep such as the bedroom. Also, install these sensors near attics and in living rooms. That way, the sensor will detect the fire sooner if it’s closer to these areas.

Flood sensors

A flood sensor works if it senses excess water in the location where it is placed. It helps warn you of any leakage from a defective appliance or broken pipe, providing an advance notice to shut the water off and save any important belongings. Not to mention, it saves you money on repairs.

When installing one, make sure to place it on the first level of your home. You may also place it inside the sump up so it will alert you before the water comes to your basement. If you don’t have a basement, you can place it near the water heater in your kitchen or laundry room.

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