Power on use: 1. Lightly press the power button once to enter the 1st gear working state, the speed is about 5000 rpm 2. Press the power button once again to enter the second gear working state, the speed is about 10000 rpm. Press the switch key once again to enter the 3rd gear working state, the speed is about 18000 rpm 3. Tap the power button once again to enter the shutdown state. During use, the load display will display the load status in real time according to the situation. 4. Overload display, when the load is too large, the overload display light will be on for 2 seconds and the overload system will shut down for protection. 5. According to the current situation of use, the user can grasp the load situation, please use it within the overload range. Name: Mini sander, rechargeable nail removal tool Adapt to grinding head shank diameter: 2.35MM Chuck depth: 25MM Speed: 5000-10000-18000 Third gear Power: 8W Use time: The third gear runs at no load for more than 1 hour. If you need to use it for a long time, you can use it while charging. Battery voltage: 3.6V Battery capacity: 300MAH Charging: 80% full in 30 minutes, 60 minutes full Instructions: Install the grinding head: 1. Put the grinding head into the chuck 2. Use the matching Hex wrench to tighten the grinding head fastening screw size: 20.2 x 13.5 x 3.4 cm Material: Metal + Plastic colour: silver Package Contents: 1 x Electric Engraving Pen Engraving Tool Set Only the above package content, other products are not included. Note: Light shooting 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.