Dragonhawk Mast Saber Wireless Battery Pen rotary tattoo machine isolated the use of tattoo cord to provide freedom on tattooing in anywhere and anyhow you wanted to.
The LED display will indicate the working voltage, voltage as well as recording your working time.

Battery Capacity: 2000 mAh Recharging Time: 2 Hours Powerpack Working time: Minimum 6 hours Output Voltage : 5 V to 12 V Stroke Length: 3.5 mm Needle protrusion:0-4.5 mm Suggest voltage for lining: 7.5 V-9 V Suggest voltage for shading:6V-8V RPM:8000-10000

Digital LED Battery Info:

• When the first light flashes the screen shows the voltage.(For example it shows 80 meaning 8.0V. The maximum voltage is 12v, but we do not recommend working with maximum voltage. 
• When the second light flashes, the screen shows the power of battery left.(When the power down to 20%, the light will keep flashing which reminds you the machine requires charging. It can work while charging.)
• When the third light flashes, the screen shows the working time of the machine.(The maximum display time is 250 minutes, if the time is over 250, the time shown in the screen will not change.) You will need to restart the machine to restart the timer.