Feature: 1. ERGONOMIC: Ergonomic design, handshaking parts fine with cutting edge non slip, even a long time of work can maintain comfort. Standard cartridge needle, 99 percent of the tattoos on the market are compatible with cartridge needle. 2. STEEL BALL: There are 2 built in stainless steel balls, rotating handle, can more accurately adjust stroke length, and will not change the length of the needle due to the machine in the process of tattoo. 3. VIBRATION: Eccentric travel 4.0mm, made of aluminum alloy, fully compatible with the motor, so that the machine is always in a low vibration state during operation, and the sound is 35 to 40 decibels. 4. MOTOR: No external tattoo power supply, tattoo foot and tattoo line, free tattoo anywhere and under any circumstances. 4 to 12V adjusted voltage, strong power, easy to find the right speed liner or shader, 12V voltage up to 12500rpm, durable and stable machine operation, easy to color, color retention effect is good. 5. RCA CONNECTOR: Can connect the RCA clip cord, convert the ordinary mode, suitable for more tattoo artist operation, cut line play fog can be compatible. Equipped with an RCA connector and a wireless power connection that can be turned into a wireless power supply for the RCA connector. 6. BATTERY: 2pcs 1800mAh large capacity batteries, replaceable operation. The battery can be fully charged in 3 hours without power. Strong endurance, sustainable work 7 to 9 hours, suitable for tattoo artists to do large area tattoo. 7. LED: High resolution LED screen, clearly display the current tattoo voltage, remaining power, operation time, convenient tattoo artist at any time to observe the tattoo status. Specification: Item Type: Tattoo Pen Material: Aluminum alloy, electronic components Machine size with wireless power: Approx. 135 x 32mm / 5.315 x 1.26in Machine size with RCA converter head: Approx. 100 x 32mm / 3.937 x 1.26in RCA connector power supply size: Approx. 85 x 32mm / 3.346 x 1.26in Built in battery: Lithium battery, 1800mAh, 2pcs Process: CNC integrated engraving Distance: 4mm / 0.157in Stroke length: 0-4mm / 0-0.16in (adjusted) Motor: Approx. 20 x 16mm / 0.79 x 0.63in coreless motorBattery port: Type C port (USB C) Usage time: 7 to 9 hours of sustainable work Charging time: Fast charging, 3 hours can be full without power Operating voltage range: 4-12V Voltage adjustment accuracy: Short press: ±0.1V, long press fast adjustment Motor speed: 12V 12500rpm LED display: Output voltage, battery capacity, operation duration Structure: Integrated lithium battery pen structure, built in lithium battery, battery parts can be rotated and disassembled Needle: 99 percent of cartridge needles on the market. Package List: 1 x Tattoo Pen1 x Replacement Battery1 x RCA Converter Head1 x RCA Connector1 x USB Cable1 x Instruction Book