Product Specification:   1 、 Bluetooth  specification:  version 1.2  class II 2 、 Frequency   Range :  2.4~2.4835GHZ ISM Band 3 、 Supported Bluetooth profiles: Bluetooth headset and hands-free profiles 4 、 Receive Sensitivity:   <-80dBm@0.1%BER 5 、 Operating range: Up to 10 meters 6 、 Talk time: Up to 4 hours           7 、 Stand-by time: Up to 100hours        8 、 Charging time: Approximately 2.5 hours 9 、 Battery type: Rechargeable lithium polymer                                                                     10. Microphone type: 4mm omni-directional 11 、 Pairing passkey or PIN: 0000 Supported special features: 1 、 Answer/end call 2 、 Voice dial 3 、 Last number re-dial 4 、 Reject call 5 、 Mute 6 、 Multi-colored LED lights for status on Bluetooth®,      low battery and charging