?Overview:This product uses 4 times noise proof technology and DSP number signal process that can ensure clear talk. Compatible with all Bluetooth phones and supporting 1-to-2 function. It can be used in office work， such as matching with SKYPE， MSN or network talk by Bluetooth adapter， which provides clear talk and more convenience.Brand: N/AModel: M10BQuantity: 1PieceColor: BlackMaterial: Plastic shellBluetooth version: Bluetooth V2.1+EDR(Enhanced Data Rate)， compatible with Bluetooth V2.0 & V2.1Chip set: CSR Blue Core 6 Bluetooth chipBluetooth function supported: Headset Profile， Hands-free ProfileTransfer rate: Class 2 Frequency: 2.4GHzTransmission distance: 10m (barrier free)Microphone sensitivity: -45dB(0dB=1V/Pa，1KHz)Talk time: 20hStandby time: 350hCharging time: <8hCharging current: 80mACharging voltage: 5VWorking voltage: 3.3~4.2VCharger power supply: 110~240VWorking temperature: 15~25→Compatible with all PS3 game machine and main brand Bluetooth phones， can voice chat onlineBattery: Built-in rechargeable li-ion batteryType: HeadphonePacking list:1 x Headphone1 x USB charging cable (75cm)1 x EU Plug power adapter1 x English user manual<img src="//112.74.112.28/down/products/446047/446047_000.jpg">