Line Art Tattoo Wireless Charging Tattoo Power Supply.Size: 75mm (length) * 32mm (width – thickness) * 55mm (height).Packing: upper and lower cover box + power cord.Color: Gold. Black Red.Instructions for use:1. The input port supplies power to the power supply, and the output interface supplies power to external devices. The built-in battery is 3, 550mA/block, 3.7V battery. The output current is fixed at 1A. 2.Output function, adjustable voltage: (5V, 6.5V, 8V, 9.5V, 11V) Each double-click key, switch voltage change, 5V first light is on; 6.5V only second light is on; 8V only third The light is on; only the fourth light is on at 9.5V; the fifth light is on at 11V; the light is from left to right, and five lights are in five gears, which are sequentially cycled.3. When the power is off, press the key to display the power (short press time is 2~3 seconds): the first light is on or less than 20%; the first and second lights are on the same as 20~40%; 2, 3 lights are 40~60% bright; 1st, 2, 3, 4 lights are bright.