5-level speed adjustment: The maximum speed of the engraving machine can reach 30, 000 rpm. Short press the button "+ /-" to adjust the speed (five optional speed settings: 5K-10K-20K-25K-30K rpm), which can be adjusted differently. material requirements, giving you more precise control. Adjust the rotation direction: When the professional engraving pen is in normal status, double-click the power button to switch the rotation direction (the corresponding indicator light will ). You can adjust the rotation direction as needed to adapt to different usage angles or usage scenarios. This 's engraving tool uses a high-quality motor to low noise and vibration during use, giving you a quiet and comfortable use experience. The cordless mini rotary tool also has overload protection, when rotation is blocked, all will flash and the device will shut down, just press the power button again to restart, thus better preventing damage to the engraving pen. Quality advantage: This portable metal engraving machine adopts an High-quality materials body, equipped with a C-type charging interface, 850mAh capacity and a working time of up to 3-5 hours. It has a built-in powerful motor with stable performance and high rotation speed. You can easily engrave and polish , grinding, drilling, cutting, polishing, , wiring materials. Specification: Power supply: Type C charging Battery capacity: 800mA Transmission speed: 5000-30000rbm (five optional speed settings) Rated voltage: 5V Drill bit diameter: 2.35mm About 3-5 hours of idle time after fully Material: Metal colour: silver Package Contents: 1 x engraving pen 1 x USB charging cable 1 x polishing drill bit 2 x drill bits 3 x Saw Head 1 x connecting rod 30 x Engraving Drill Bits 2 x template (random style,Cannot be chosen the specific style.) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.