Description:Model: Q9Bluetooth Version: 4.1Machine size: 0.8 x 3.8inch/20 x 97mm; headset Size: 0.8 x 0.9inch/20 x 22mmInput voltage: DC12V-25VBattery: Lithium Polymer 3.7V / 25mAHUSB charger output: 1，5V-2.1A; 2，5V-1ACharge time: 1.5HContinuous talk: 1.5