Type: Bluetooth Stereo headphoneModel: XK-668Color: BlackBluetooth version: 4.0Operating voltage: 3.6VOperating current: BT25mA; Mp345mAStandby current: 0.5mATransmission distance: Max.20mBattery: Li-on batteryMusic time: BT 10H; Mp3 8HCharge time: 2HTalking time: about 12HStandby time: about 260HCharge port: USBPlug type: 3.5mmAudio formats: MP3/WMA/WAVItem Size: Approx. 16 * 19 * 7cm / 6.3 * 7.5 * 2.8inItem Weight: Approx. 135g / 4.8oz