Bring the best sound to your active lifestyle, Run Free Pro HD, a sports earphone enhancing your motivation with true sports functions. Balanced Armature DriversThe powerful Knowles® balanced armature drivers, perfectly separated between lows, mids and highs, takes your motivation to a new level during your training and workout. Extended Playtime With Fast ChargeRun Free Pro HD keeps you moving with 12-hour of playtime. Forget to charge before your training or workout? Our fast charge gets you an up to 90-min of playtime in just 15-min. Guaranteed To Stay On Even In The Toughest WorkoutInterchangeable ear lock system and memory foam ear tips secure your Run Free Pro HD in place like no other earphones. Weatherproof Nano Coating TechnologyAdded protection from exposure to sweat and water with washable earpieces, enjoys your Run Free Pro HD anytime, anywhere without missing a beat. Reflective CablesDesigned for maximum visibility during workout at night.