"Material: Aircraft aluminum Working volt: 4.2-12V DC Stroke: 4.2mm Power supply:Detachable power supply/RCA cord Charging voltage: 5V/2A Charging time: 3 Hours Usege time: 4-8 Hours

Advantages: 1: Buttons controls voltage, easy to operate. 2: Replaceable grip, easy to steralize. 3: Extra RCA connector, you can change the battery to RCA connector, then you will get a normal machine from wireless machine. 4: Replaceable battery, can order more battery to repalce it."