AVA Wireless Tattoo Power Battery. Main features: - RCA connection. - Charging time: 3 hours. - Charging voltage: 5V / 1A. - Working voltage: 4V ~ 12V. - Weight: 71.5 gr. Long press the green button to turn on and increase the voltage Long press the red button to turn off and decrease voltage The box includes: 1x AVA wireless power supply. 1x USB charging cable.