The Bose Bluetooth Headset Series 2 offer Bose-quality sound even in windy conditions. A2DP audio streaming allows you to listen to podcasts. hear turn-by-turn directions. and talk to voice recognition programs on your smartphone. The rechargeable lithium-ion battery allows 4.5 hours of continuous talk time or 100 hours in standby. The noise-rejecting microphone allows callers to hear you. and the flexible StayHear tip provides comfort and support. The headset is available in both a left and right ear form.