1 Easy to use: The power supply of the tattooing machine is compact and very convenient to use. Redundant hook lines that are not affected by location are eliminated, so you can work anytime, anywhere.2 Fast charging: small size, high energy, capacity 2000mAh, voltage 6-8V, can be used for 2 to 3 hours. Through fast charging, the tattoo device can be fully charged within an hour.3 Convenient to carry: The wireless tattoo power supply is light and easy to carry, so you can get tattoos outdoors to make the tattoo more comfortable. The digital display is clear at a glance, allowing you to capture the voltage in real time.4 Instructions: (1). Press the power switch for 3 seconds to turn the machine on and off. The remaining power will be displayed at this time, and then switch to the current voltage. (2). Short press the + or-button to increase or decrease the voltage of 0.3 V. (3). Short press the power switch to rest. (4). Press the power switch for 2 seconds to turn off the device.5Eliminate the redundant hook line, not affected by the location, so that you can work anytime and anywhere.