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Color: Black Material: ABS+775 copper-clad aluminum motor Product size: approximately 17.4 * 11.7 * 12CM Working voltage: 21V Rated current: ≤ 4A Rated power: ≤ 200W Idle speed: 6000RPM Maximum efficiency: 70 η Maximum allowable power: 80W Number of stator slots: 5 Number of rotor poles: 2 levels Speed regulation: plug in 7th gear Power type: rechargeable, lithium battery Main applications: Processing of multiple materials such as jade, wood, jewelry, and hardware, covering diverse scenarios such as manual DIY, small workshops, maintenance and polishing 1. Dual power supply mode: Plug in power supply (standard 7-speed variable speed power supply) 2. Lithium battery power supply *One side has a brownish red coarse sand wheel, which quickly removes rust, blades, and excess materials; One side white fine grinding wheel, precision grinding tools, polishing workpieces, eliminating burrs, from low-speed fine polishing to high-speed strong polishing, with one click gear switching *Upgraded heat dissipation structure, less likely to overheat and burn out even after long-term operation, with a longer service life *7-speed precise matching of material characteristics: low speed suitable for fine polishing of jade/jewelry, medium speed suitable for shaping of wood/plastic, high speed suitable for rough grinding and deburring of metal/hardware, completely eliminating the problems of "over grinding damage" and "inefficient operation" Packing list: 1 * Host 1 * Adjustable speed plug-in power supply 1 * Brown grinding wheel 1 * White grinding wheel 1 * Towel 1 * Screw tool 1 * Instruction manual