Function: 1. EFFECTIVE: Real and effective, can effectively remove dead skin, thick calluses, leave no traces, easily remove dead skin on the bottom of the foot, foot flakes to prevent the accumulation of dead skin on the foot in the stratum corneum. 2. MATERIAL: Selected silica to create, no pulling feeling, does not hurt the skin, only light grinding, aging keratin can be removed, coarse and fine grinding head while massaging acupuncture points. 3. GENTLE: rounded and fine particles, grinding does not hurt the feet, arc design is closer to the skin of the foot, flat grinding head can contact 86% of the foot surface, arc grinding head can contact 98% of the foot surface. 4. POWERFUL AND FLUSHABLE: Detachable flushable abrasive head to avoid the reproduction of harmful substances, durable power, built-in powerful motor to remove calluses effectively. 5. GIFT: You can give this electric foot grinder to your friends, wife, parents, so they won't be bothered by old calluses on their feet anymore. Specification : Item Type: Foot Sander Material: ABS Battery specification: 4 AAA batteries (batteries not included) Application: Foot scrubs for removing calloused epidermis Package List: 1 x foot grinder 1 x replaceable head 1 USB cable 1 x User Manual 1 x brush Installed in 4 AAA batteries or connect the USB cable can work (connect the USB cable to make sure there is no battery installed inside or it will cause a short circuit).