Specifications:Color: Black.Bluetooth Vision: BT2.1.Working Voltage: 3.3V-4.2V.Talking Time: 8 hours.Standby Time: 150 hours.Charging Time: 2 hours.Speed up to 120KM/H.Built-in lithium polymer battery.Production Dimensions: 23.0x4.5x0.5cm.Working Temperature: -10≧！+45≧.Small in size、 easy to install and carry around.Package Includes1x Bluetooth headset1x Charging cable1x User Manual