brand new and high quality Features: The wireless tattoo power supply is made of aluminum alloy material, solid and sturdy to use. Portable and lightweight, it is convenient to carry and use. Wireless design save you more space and reduce danger of stepping on lines. Tattoo power supply,easy to operate with no lines, you will get the practical tool. It is a great gift for professional tattoo artists and tattoo lovers! Notice: no using charger higher 5V (all at your own damage) Instructions: Full charge for first use Press the five-way switch in the middle: Long press on/off, short press pause/start The top and bottom of the five-way switch are voltage plus and minus (0.5V per voltage adjustment) Press right to display the power percentage, and press left to return the voltage interface If power less than 19%, charging lamp will flash: plug in charger and the lamp stay on full power, full power display light on Specification: for Shell Material: Aluminum alloy Input voltage: 5VDC Output voltage: 4.5-12V Battery: Lithium-ion battery Battery capacity: 1500 mAh Charging time: about 5 hours (different chargers have different charging times) Working hours: about 4-6 hours of normal use Power conversion rate: greater than or equal to 75% Color: Black Size:app. 79 x 30mm / 3.11 x 1.18in Quantity: 1 pc Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Wireless Mini Tattoo Power Supply(other accessories demo in the picture is not included.)