1、Adjustable Steel Ball: There are 2 built in stainless steel balls. When the handle is rotated, it will make a crisp sound during adjustment. 2.0‑4.0mm can adjust the length of the needle more accurately, and it will not change the length of the needle during the tattoo process. 2、LED Display: Tattoo pen with carved anti slip handle clearly display the current tattoo voltage, remaining power and power up function, which is convenient for tattoo artists to observe the tattoo status at any time. 3、Powerful Cordless Motor: 4‑12V adjustable voltage, strong power, easy to find a suitable speed for liner and shader, 2.0A output, 10000r/m at 10V voltage, durable and stable machine operation, easy coloring and good color retention effect. 4、Convertible RCA Connector: Connect RCA clip cord, convert normal mode, and use it for two purposes, which is suitable for more tattoo artists to operate, and can be compatible with liner and shader. 5、Built In Battery: 2200mAh large capacity battery, realizing wireless operation. The battery can be fully charged in 1.5‑2 hours without electricity. Strong endurance, can work continuously for 7‑8 hours, suitable for tattoo artists to do large scale tattoos. 6、4.0mm Stroke Of Eccentric Wheel: It is made of aluminum alloy and steel, which is completely compatible with the motor, so that the machine is always in a low vibration state during operation, and the sound emitted is 35‑40 decibels. Item Type: Wireless Tattoo Pen Material: Aluminum alloy, electronic components Machine Size With Wireless Power Supply: Approx. 133 x 34mm / 5.2 x 1.3in Machine Size With RCA Conversion Head: Approx.110 x 34mm / 4.3 x 1.3in Battery: Built in lithium battery 2200mAh. Technology: CNC integrated carving Stoke: Approx. 4mm Needle Length: Approx.2.0-4.0mm adjustable. Item Type: Cordless motor Battery Interface: Type c interface (USB C) Service Life: The output current of the battery is 2.0A, and it can work continuously for 7-8 hours. Charging Time: Fast charging, which can be fully charged in 1.5-2 hours without electricity. Working Voltage Range: 4-12 V; Voltage Regulation Accuracy: Short press: ±0.1V, long press: 0.5V. Motor Speed: 10V 10000r/m LCD Display Content: Output voltage, battery capacit, strong start mode. Structure: Integrated lithium battery pen structure, built in lithium battery, and the battery part can be rotated and disassembled. Needle: Universal 99% tattoo cartridge needle on the market. 1 x Wireless Tattoo Pen 1 x RCA Adapter 1 x USB Charging Cable 1 x Accessories Package (Accessories Are Shipped At Random) 1 x Storage Box