Feature: 1. OLED DISPLAY: Wireless tattoo pen features an OLED display that shows the current voltage, battery level, operation time, and current frequency. 2. 2.4 TO 4.2MM STROKE: Wireless tattoo pen offers a range of adjustable stroke lengths, including 2.4mm, 2.7mm, 3.0mm, 3.3mm, 3.6mm, 3.9mm, and 4.2mm. 3. CARTRIDGE NEEDLE: Designed to be compatible with 99% of tattoo needles available in the market, this wireless tattoo pen allows for seamless and hassle free needle changes. 4. CORELESS MOTOR: Equipped with a powerful 10500RPM coreless motor, this wireless tattoo pen offers stable and consistent performance, ensuring precise needle movements for liner shader. 5. FAST CHARGING: With a built in 2400mAh lithium battery and fast charging capability, this wireless tattoo pen can be fully charged in just 2‑3 hours, providing continuous working time of 8‑10 hours. 6. WITH RCA ADAPTER: Wireless tattoo pen comes with a RCA adapter, allowing for easy switch between wireless and wired mode. Tattoo artists can use the included RCA clip cord to connect the pen to a power supply. Specification: Item Type: Wireless Tattoo Pen Material: Aluminum, Electronic Components Wireless Tattoo Pen With Power Supply Size: Approx. 145 x 42mm / 5.7 x 1.7in Machine with RCA Adapter Size: Approx. 129 x 42mm / 5.1 x 1.7in Battery: Built in 2400mAh Lithium Battery Craftsmanship: CNC Carved Needle Stroke Length: Adjustable in 7 levels: 2.4mm, 2.7mm, 3.0mm, 3.3mm, 3.6mm, 3.9mm, 4.2mm Motor: Approx. 18 x 27mm / 0.7 x 1.1in Motor Vibration Value: 0.3m/s² Decibel Level: 39-42dB Motor Speed: 12V, 10500RPM Battery Interface: Type C Interface (USB C) Charging Time: Fast Charging, 2-3 hours for full charge from empty state Usage Time: Continuously works for 8-10 hours Operating Voltage Range: 4-12V Voltage Adjustment Accuracy: Short press: 0.1V, Long press: Fast voltage adjustment OLED Screen Display: Output voltage + Battery capacity + Operation time + Current frequency Structure: Integrated Lithium Battery Pen structure, with a detachable and rotatable battery compartment Needles: Compatible with 99% of tattoo needles available in the market.. Package List: 1 x Wireless Tattoo Pen1 x RCA Adapter Heads1 x RCA Clip Cord1 x USB Charging Cable1 x Accessory Kit (Accessories Shipped Randomly)1 x Storage Case