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Stigma wireless battery power supply penFeaturesStarting voltage: comes with 12V instant strong start functionEffective needle length: 3.0mm Adjustable stroke: 1.0-4.0mm Appearance process: fine sand black/redInput interface: RCABattery capacity: 2000mAh (usually available 7h, 2.5h for charging) Adjustable voltage: 5.0-13. 0V DC. Functions: 1. The machine screen displays three data of current-voltage, remaining power ratio and boot time, and the three data are scrolled; 2. The set comes with 5 types of handles, can be select according to actual use; 3. Rotation and speed. When the handle adjusts the length of the needle, the card needle port will not turn.Motor: 26 * 7.0 shaft length 7.0mm in motor specificationsRated voltage 12V10W rated power8V speed.7000RPM.10V speed 8750RPM12V speed 10500RPMFive different controllers and a USB-to-Android data charging cable.One year guarantee.