When it comes to both high quality sound and uninhibited situational awareness, the AfterShokz Sportz M3 headphones are unrivalled. Tune into your music and make or take phone calls without missing a beat. OpenFit design allows for unmatched ambient sound awareness and extended comfort. Bone conduction technology uses vibrations to transmit sound waves directly to the cochlea through your cheekbones. PremiumPitch patented dual suspension transducers guarantee the finest bone conduction audio. In line controller with onoff switch and microphone lets you maketake phone calls, control volume, and playpauseadvance your music. Comfortable wraparound headband is stable, water and sweat resistant, and fits a wide range of head sizes. Reflective safety strip on the back of the headband offers enhanced visibility in lowlight conditions. Rechargeable Li ion battery lasts up to 12 hours 10 days on standby recharges in 2 hours via micro USB port. 3.5mm gold plated jack fits most smartphones, mp3 players, iPhones, iPods, and iPads. Cable is 51 in. 130 cm long including in line controller. Includes a zippered storage case and micro USB charging cable. Weighs 1.6 oz. 45 g.