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.Bare metal weight: 58 grams.Notes on charging:1. The power of the electric grinder is generally about 50% when it leaves the factory. It needs to be fully charged before the first use.2. The charging port adopts USB-TYPE-C and the charging port of Android smartphone is the same.3. Please use a standard USB charger or computer USB to charge the electric grinder4. Do not cover items when charging to ensure good heat dissipation.5. Power display: 1 light=30% 2 lights=31%~70% 3 lights=71%~full6. After fully charged, the electric grinder will automatically turn off the power and turn off the lights.7. When not in use, it needs to be fully charged and placed and charged every six months.Kind tips:This type of electric grinder has low power, non-professional electric grinder, and is suitable for small engraving and grinding fields.Do not place the electric grinder in a high temperature place above 40 degrees.Instructions:Install the grinding head:1. Put the grinding head into the chuck.2. Use the matching Allen wrench to tighten the grinding head fastening screws.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 rpm3. Press the switch key once again to enter the 3rd gear working state, and the speed is about 18000 rpm.4. Press the power button once again to enter the shutdown state.5. During use, the load display will display the load status in real time according to the situation.6. 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.7. According to the current situation of use, the user can grasp the load situation, please use it within the overload range.Package Details:1 host.1 charging cable.Drill bit: 1.0MM, 1.5MM.Slice 22MM, 25MM, 32MM .Slicing connecting rod: 1 piece.Grinding needles: 30 pieces.Metal grinding head: 1 pc.