GUARANTEED TO STAY PUTFinally, Wireless Headphones that Stay in Place! Lightweight and comfortable, the EDGE IPX4 Bluetooth Headphones give you the freedom to go wire free with ultra high quality sound, clarity and power.CRYSTAL CLEAR PHONE CALLSWith a built in microphone and a single button call answering feature that includes SIRI and Google Voice integration, the EDGE makes it easy to be hands free during calls, even when you're 30 feet from your phone. EASY TO USE CONTROLSThe EDGE incorporates easy to use controls for track forward, track back, volume up, volume down, playpause and phone calls, making it simple to operate your audio device without missing a beat. DESIGNED FOR ACTIVE USEDesigned for running, cycling, working out and other sports, the EDGE is certified IPX4 water sweat resistant thanks to our advanced nano coating process, applied to all internal electronics during assembly. NOT JUST FOR WORKING OUTThe EDGE is designed to also function as your hands free phone headset. Utilizing a built in microphone and easy to use 1 touch call answering, Siri Google Voice integration for texting or voice dialing, the EDGE will make your calls and busy day more productive.UP TO 8 HOURS RUN TIMEThe EDGE runs on a rechargeable lithium ion battery which provides up to 8 hours of continuous use and requires only 1 hour to recharge.