Features: 1. Standard BT V1.2, CSR BC03 Stereo chip 2. Data Rate, Asynchronous: 723.2kbps/57.6kbps, Synchronous: 433.9kbps/433.9kbps 3. Frequency Band ISM 2.4GHz 4. RF Output Power -6~+4dBm (Max +6 dBm) 5. Operating Distance Up to 5 meters 6. Operation Temperature -10~+55 Degree C 7. Storage Temperature -20 to +65 Degree C 8. BT Profile: A2DP\AVRCP\Headset Profile\Handfree Profile. 9. Rechargeable Lithium Polymer 150mAH 10. Talking time: 5 hours talk time, 100 hours standby time 11. Voice command: For dialing out (subject to mobile phone support) 12. Noise: Noise suppression microphone 13. Last number Redial: For dialing out ( subject to mobile phone support) 14. Two ear speakers can listen to the phones MP3 music via BT Controls: In microphone, on/off button, volume button, on/off colors LED indicator Accessory: 1). USB Charging line. 2). User guide. 3). Glasses box 4). Glasses cloth