Feature: 1. 3 DIFFERENT TYPES OF ROLLERS: Delicate rollers for daily foot care, regular rollers for normal dead skin or calluses, rough rollers for thick calluses or hard dead skin. 2. 2 SPEED ADJUSTMENT: 6000rmp/min at low speed, 8000rmp/min at high speed. low gear speed is suitable for delicate skin care, high gear speed is suitable for thick wound tissue or dead skin. 3. CALLUSES REMOVAL: You can choose the speed you need according to the dead skin or calluses on your feet. If the pressure is too strong, it will stop working automatically to avoid damaging healthy skin. 4. AUTOMATIC SWITCH OFF: Gravity sensing auto shut off feature reduces the risk of scratching by automatically stopping the operation when excessive pressure is detected. 5. SAFETY TO USE: Foot grinder has no harmful blades and roller surfaces that can harm your skin, providing a safe and gentle exfoliation experience for soft and smoothing feet without causing any irritation or discomfort. Specification: Item Type: Rechargeable Electric Foot File Material: ABS Battery: Lithium battery, capacity 600 mAh (built in) . Package List: 1 x Foot Grinder 2 x Replacement Heads 1 x USB Charging Cable 1 x Instruction Manual