Features:Single Track.Portable behind-the-head wearing design, convenient for sports.Allow you answer or reject phone calls anytime and anywhere.Built in Microphone for Handsfree Cell Phone use or chatting on QQ, MSN.Built-in lithium battery (charged via USB).

Specifications:Bluetoooth

Features:Single Track.Portable behind-the-head wearing design, convenient for sports.Allow you answer or reject phone calls anytime and anywhere.Built in Microphone for Handsfree Cell Phone use or chatting on QQ, MSN.Built-in lithium battery (charged via USB).

Specifications:Bluetoooth version:Version 2.1Frequency: 2.4 - 2.48GHzSupport format: MP3 WMATalk time: Up to 4 HoursCharge time: 2 hoursPower source: Built-in Li-ion Battery (USB  Charging)System requirement: Windows 98 or aboveMaterial: PCItem color:BlueItem size: 15 * 13cm/ 5.9 * 5.1inItem weight: 33g/ 1.2ozPackage size: 19.5 * 16.5 * 7cm/ 7.7 * 6.5 * 2.8inPackage weight: 85g/ 3oz

Note:Compatible with most bluetooth enabled cellphones when used to answer or reject the phone calls but only compatible with Nokia devices when to listen to music!