Get crystal clear music and calls with the 66 Audio BTS Sport Bluetooth Headphones. Compatible with virtually any Bluetooth device, these headphones specially pair with iOS devices as it displays a real time battery indication on the screen. On top of dishing out powerful sound, these headphones are also equipped with a built in noise cancelling microphone and they also have a battery that will give you 30 hours of continuous music play or 500 hours on standby. A convenient multi-function button on the BTS Sport Headphones allows you to answer calls, change tracks, adjust the volume, and even initiate Siri without touching your phone. Wrapping around the back of your head, these cushioned headphones are ergonomic to cover the ears and will stay in place no matter what your activity.