Bluetrek S2 Bluetooth Headset - Silver 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, waiting call, etc. Compatible with Bluetooth enabled devices such as mobile phones, PDAs & computers that support Headset and / or Hands-free profile Removable & adjustable ear hook which allows the headset to be worn on either ear comfortably. Comfortable even when wearing glasses! Bluetooth specification: V1.1