Features: Giving off fresh mist to moisten, purify and refresh the air around you. With two USB interface to charge your devices, charging and humidifying simultaneously, enriching your car journey. Lightweight mini design, very easy to use, powered by DC 12V vehicle power supply. You can drop the aroma oil or essential oil(not include) into water to make the air fresher and fragrant. Automatic power off: Automatic shut-off after 2-hour use prevents overheating and get rid of safety concerns. Perfectly applicable in the car, enjoy the fresh air on the road!