Specification： Bluetooth Version: 4.1 Range: 33 feet (10 meters) Music/Talking Time: 20-25 hours Charging Time: 4 hours Charging Voltage: 5V Battery Capacity: 420mAh Packing List： 1x Mpow 059 Bluetooth Headset 1x 3.5mm Audio Cable 1x USB Charging Cable 1x Packing Bag 1x User Manual