Visilble LED screen shows "operating voltage""capacity" "timimg" .
2 modes of voltage operation that by "click" or "long press" voltage button, +/- 0.1v.
Wireless tattoo power supply can work 2-3 hours with ONE battery for tattooing.
Two replaceable wireless batteries, charged fully in 1 hours.
This wireless tattoo power supply can compatible with all RCA connector rotary pen tattoo machine.
Connecter: RCA Material: Aircraft aluminum Operating Voltage: 5 - 12 V DC Net Weight: 2.33 oz (66g) Size: 62 X 34 X 50mm LED Display: Voltage, Capacity and Timer The Packages Included: 1Pcs Battery Pack, battery charger, 1000 mAh battery X 2 (3.7V LI-ION 14430 / 14*43mm)