Bluetrek X2 Water-Resistant and Weatherproof Bluetooth Headset 14 hours talk time and 500 hours standby time Unique super-durable, antiallergic silicone rubber ear loop (2 different sizes included) 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: V1.2