ELITE FLY-V3 has 4 channels for saving voltage settings
The battery can be changed easily

Battery : Panasonic 18500
Stroke Length : 3.5mm&4.0mm
Operation Voltage : 4-12V
Speed : 10400rpm
Battery Capacity : 2040mAh
Dimensions : 33.5mm x 125mm
Battery Life : 8-12 hours depends on Voltage and Cartridges

PRICE includes 1 ELITE FLY-V3 Wireless Tattoo Pen Machine & 1 Charger with Cable