Description:Version:V4.0 EDR Function:bluetooth / handsfree /wireless Frequency Range:2.4GHz Playing Time:4 Hours Standby Time:160 HoursRechargeable Battery:150 mAh Receiving sensitivity:<-80dBm Compatible Brand: Bluetooth Devices，PDA，PC etc. Features:Can not only connect with two mobiles at the same time，but also control them simultaneously Heavy bass effect， Enjoy Beautiful Music in a better way Built-in lithium battery (Charge via USB)， When your S9 Bluetooth Headset is in double connection status(Connecting with two mobiles)， you are not able to play music on both two mobiles， but one of them. Note:1.In order to extend life span of the product，please don't charge more than 3 hours.2.Please do not use when charging. Package Included:1* bluetooth headset1* usb cable