1. The headset complies with the bluetooth 1.1 protocol and works at 2.4 GHZ ISM band. 2. It supportsthe Bluetooth Headset Profile 1.0 and Hands-free profile 1.1. 3. It provides data encryption function. 4. The communication distance between the headset and mobile phone is within approximately 10 meters. 5. The talk time is about 2~4 hours (which depends on the types of mobile phones) 6.The standby time is up to 120 hours. 7. The operation condition should be within -10 degrees to 45 degrees. 8. The battery is rechargeable Li-polymer. 9. The charging should take about 2 hours. 10. The headset weighs 14 grams. 11. The headset volume is: 71*23.5*24mm.