Mast Tour Pro Coreless Motor Permanent Tattoo Rotary Pen Wireless Machine Kit with Two Batteries Mast Pro Needles Cartridge Set Machine characteristics : Net Weight: 127g Machine Length: 85mm Machine Diameter: 32mm Needle Protrusion: 0 up to 4mm Stroke Length: 3.6mm Continuous, quiet, and gentle operation Custom Mast coreless motor Battery characteristics : Material:Aluminium Output voltage:6-11v Input voltage:DC5V/1A Power display:20-100 Working time:Charging for three hours, working for six hours Charge mode:Type-c Connection:RCA cord Battery capacity:1200mAh Size:27.5mm*62.8mm N. W:57g 1.Output short circuit protection 2.Dual input charging protection (batteries and the control board both equipped with shutdown,overshoot and over discharge protection) 1.Press and hold the power button 2 seconds to turn on/off. 2.Click the power button to adjust the voltage 6 7 8 9 11V. 3.Default booting at 10V start-up voltage in 0.2s,then load to the last memory working voltage. 4.It will shift to display the capacity of battery without working over 2s, and the indicator light is on the breathing state,the five indicators represent for 20%-100% of the power capacity,Click the button return to voltage display. 5. The indicator light is blinking during charging, stop blinking with the overshoot protection working when full charged. 6.The pack capacity is 1200mAh,3.5 hours to be full charged at above 1A charger,about 8 hours working at 8V . 7.This pack is only for rotary machines but coil machine. 8.Don't use this pack while charging.