The Plantronics Backbeat 903+ is great for workouts, commutes, or just chilling out at home. Immerse yourself in rich audio streamed from your iPhone, smartphone or Bluetooth enabled MP3 player. There is even an iPhone battery meter.Wherever you enjoy listening to your music, never miss a beat or a call with easy-touch button controls.With three levels of size adjustment you can find a perfect comfortable fit for whatever you are doing, and the ruggedized, flexible design lets you toss it in a gym bag or stow it in the handy carry pouch.