Specification: Item Type: Electric Grinder Pen Model: XYF-DM-216 Material: ABS, copper Uses: Grinding, polishing, micro-carving, micro-cutting, micro-drilling Power Supply Mode: 3.7V 2000mAh 18650 lithium battery x 1 (built-in) Clamping Range: Approx. 0.3 ~ 3.2mm / 0 ~ 0.1in Machine Speed: First Level: 6000r/min Second Level: 9000r/min Third Level: 15000r/min Maximum Power: 30W (product use power, not product use idling power) Charging Input Voltage: 5V Product Length: Approx. 190mm / 7.5in Bottom Width: Approx. 28mm / 1.1in Head Width: Approx. 9mm / 0.4in Package List: 1 x Electric Grinder 1 x Charging Cable 1 x Plug 2 x Grinding Wheel Head 2 x Connecting Rod 5 x Brass Chuck 2 x Sharpen Grinding Head 2 x Drill Bit 1 x Saw Blade 6 x Gauze Ring 1 x Parts Storage Box 1 x Storage Box Note: 1. Electric grinder charging: a special charger is required for charging. The blue indicator light flashes during charging until all 3 indicator lights are on, indicating that it is fully charged (if you use a power bank, you must use a regular manufacturer) 2. The machine cannot be used during the charging process, it is not that the machine is damaged 3. It is normal for the machine to slightly heat up during the charging process or during use; 4. Three levels for speed control, press once for the third level, then for the second level and then for the first levelr, the speed is from high to low respectively 5. USB charging port design supports charging with power bank