Feature: 1. Adjustable Needle Stroke: Tattoo pen adopts a high speed strong magnetic torsion motor, with strong force and higher penetration, providing high frequency needle output speed, faster coloring, effectively reducing skin damage. Double steel ball buckle design, stably adjust the needle output. 2. Ergonomic Design: Machine body is frosted, comfortable to hold, reducing the working fatigue of the tattoo artist. Suitable for most tattoo cartridge needles on the market, matched with RCA interface tattoo clip cord for wired and wireless operation. 3. Tattoo Power Supply: 3‑12V adjustable voltage, voltage adjustment accuracy is 0.1V, which meets the speed requirements of tattoo artists to operate different parts. Standard RCA interface, suitable for most RCA interface tattoo machines. Tattoo pen and wireless tattoo power supply are used together. 4. Long Endurance: The power supply has a built in 1500mAh large capacity battery. When fully charged, it can continue to work for 7 hours under the 5V working voltage. LCD display is designed to display the current voltage and battery remaining capacity, convenient for tattoo artists to observe and operate. 5. Complete Tattoo Set: Suitable for professional tattoo artists and tattoo beginners. Aluminum alloy tattoo pen body and tattoo power supply shell, firm and durable. Specification: Item Type: Rotary Tattoo Pen Set Material: Aluminum alloy, electronic components Product introduction: 1. Tattoo Pen Applicable Needle: Used for most tattoo cartridge needles on the market Interface: RCA interface Tattoo Pen Size: Length (Without Needle): Approx. 86mm / 3.4in, Diameter: Approx. 32mm / 1.3in Stroke: Approx. 3.5mm / 0.1in Needle Discharge Length: Approx. 1-4mm / 0.04-0.16in Working Voltage: 6-9V, do not overload work for a long time Voltage Speed: 9000-12000RPM 2. Tattoo Power Supply Product Size: Approx. 32 x 51mm / 1.3 x 2in Battery: Built in lithium battery 1500mAh Output Voltage: 3-12V adjustable, adjustment accuracy 0.1V Power Supply Interface: RCA interface Charging Interface: USB Type C Charging Voltage: DC5V / 1A Charging Time: 2-3 Hours Endurance Time: When fully charged, it can continue to work for 7 hours under 5V working voltage Characteristics: 6V strong start. Package List: 1 x Tattoo Pen1 x RCA Interface1 x Wireless Tattoo Power Supply1 x USB Charging Cable Note: Please allow slight error due to manual measurement. Thanks for your understanding.