Product information Voltage: USB charging DC5V, compatible with car charger, computer USB, power bank, and other USB power sources Power: 6W Charging time: approximately 2.5 hours Motor speed: approximately 13,500 RPM Unit speed: high speed approximately 2,200 RPM, low speed approximately 1,700 RPM Main functions: 1. Removes dead skin, calluses, and cuticles 2. Vacuum and collects skin particles How to use: Press and hold the power button for 2 seconds to turn on. The device starts in low speed mode by default with a green indicator light. Press the button briefly to switch between speed settings. Battery type: 1200 mAh lithium-ion battery, runtime up to approximately 100 minutes depending on usage and cleaning intensity Water resistance: The device is water-resistant. After use, the head can be rinsed under running water. The entire unit can be rinsed under a tap for cleaning. Do not submerge in water for extended periods. Features: 1. Built-in vacuum and dust collection system 2. Switch freely between high and low speed settings 3. Fully washable design (rinse under running water; not for prolonged immersion) 4. 1200 mAh high-capacity lithium-ion battery with fast charging and long runtime; low noise operation 5. Charging indicator light changes during charging; light function adjustable between two brightness levels 6. Built-in overcharge and over-discharge protection 7. Sleek, design with anti-slip ergonomic handle Package includes: Foot grinder with one coarse grit grinding head (pre-installed), one additional coarse grinding head, one fine grit grinding head, USB charging cable, cleaning brush, one transparent protective cover, color box, and user manual