Immerse yourself in rich audio streamed from your iPhone, smartphone or Bluetooth enabled MP3 player. There's even an iPhone battery meter. Wherever you enjoy listening to your music, never miss a beat or a call with easy touch button controls. The voice alerts also let you know the status on battery, music track forward and back, mute, out of range and more. With three levels of size adjustment you can find a perfect comfortable fit for whatever you're doing, and the ruggedized, flexible design lets you toss it in a gym bag or stow it in the handy carry pouch.