The Plantronics M55 Bluetooth headset features DeepSleep mode, which can extend the standard 16 days standby time up to 5 months. Noise and wind reduction means that your voice is heard on calls, not disruptive background noises. You can listen to music, Internet radio, or GPS, and even charge while traveling with the discreet car charger. Whispered alerts keep you informed about battery level, Bluetooth connection, and more. Forget buttons, use your voice to take calls - just say "answer". And no matter how long the call takes, the super soft ear tip will keep you comfortable.