Bluetrek S2 Bluetooth Headset - Black 10 hours talk time and 500 hours standby time Dedicated sound in the speaker for low battery, switch on, switch off, pairing, volume adjustment, voice activation, reconnection request, call waiting Compatible with Bluetooth enabled devices such as mobile phones, PDAs & computers that support Headset and/or Hands-free profiles Removable & adjustable ear hook allows the headset to be worn on either ear comfortably. Comfortable even when wearing glasses! Bluetooth specification: V1.1