MOTOROLA H3 BLACK BLUETOOTH HANDS FREE HEADSET Compatible with Bluetooth 1.2- or 1.1-enabled mobile phones, PDAs, PCs and more Ergonomic, removable ear hook with improved back housing design to form fit to your ear to allow for the user to wear the headset on either ear Blue LED light to notify when the headset is in use than can be turned off if preferred "Up to eight hours of talk time** or 150 hours of standby time** from a single charge 3-way call conference  join 2 separate calls into conference with headset buttons and Advanced Volume controls: adjust orientation of volume up button and also mute the headset