Detailed Product Description Bluetooth Headset,usb*Talk time: 5-7hours*Standby time: 7 days*Connect to Bluetooth enabled Mobile PhonesBattery ... is replaceable Smaller size, bigger power*Main chip: CSR BlueCore2 Audio versionBluetooth 2.4GHz2 ... in security)*Max Power: +2dBm, *Sensitivity: -80dBm Suitable Bluetooth mobile, PDA, computer, etc. Talk time 7-8 Hours ...