USB Cordless Rotary Tool Drill Engraving Pen Electric 3 Speed Mini Wireless Drill with Accessories Set 8500r-21000rpm Production information Product name: Lithium Electric Grinder Clamping range: 0.5-3.2mm Power: 35W Input Voltage: 5V 2A Output Voltage: 3.7V 3 Speed Regulation: 8500r-16500-21000r/min Net weight: 226g Battery capacity: 2200mAh Battery model: 18650 Charging interface: USB/Type-c Type Application: Suitable for Caring, Polishing, Cutting, Drilling, Polishing, Cleaning, Trust Removal, etc Strong endurance, large capacity lithium battery 2200mAH large capacity, lithium battery safe and durable, long-lasting battery life Intelligent chip, 3-speed control button 8500rpm/16500rpm/21000rpm Equipped with overheat and overload protection function, controlling speed, suitable for various creative needs 35W high-power pure copper motor Built in with a powerful core, the high-power pure copper motor is surprisingly powerful All copper clamp core, high concentricity without shaking Durable and resistant to drilling, allowing for quick replacement of chucks Clamping range: 0.5-3.2mm 3D efficient heat dissipation Efficient heat dissipation system, protecting the motor, durable and extending its lifespan