LED: The tattoo pen battery set has a large LED digital display screen, which makes the voltage output display more accurate, which is very convenient and practical. Lightweight And Compact: The tattoo power supply kit is light and compact, allowing the power supply and your tattoo pen to be integrated into one, and operate freely. The tattoo power supply has a built in 1400mAh large capacity battery quality Item Name: Tattoo power supply Battery: Lithium battery 1400mAh(built in) Power Interface: interface Charging Port: USB type C Charging Voltage: RCA 5V Charging Time: 4 hours Duration Of Battery Life: When fully charged, the 5V working voltage can continue to work for 4-8 hours Colour:Black Material:plastic Package Contents: 1 x Tattoo Power Supply(Due to different product batches, the appearance may be different, which does not affect use.) 1 x USB Charging Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.