Features:REUSABLE: Refillable grinder head is detachable, take it off for clean or replacement after using. Spare coarse roller head provided for delicate and rough-grinding over the feet.INNOVATIVE DESIGN: USB charging port supports computer, mobile power, supply usb charger,ect.you can charge the device fast anytime anywhere, use it more conviniently.Efficiently removes dry, cracked dead skin on feet with powerful motor and 360rotatable to reach-any corner of foot.POCKETABLE AND SAVE SPACE: As this callus is designed to be slim and small, it saves space and can be taken anywhere when travel.With Speed Adjustables: The speed of electric foot callus remover is adjustables, you can adjust the right speed to remove callus on your feet.Notice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurement Description:Charging Method/Charging Voltage: TYPE-C connector/DC 5VWorking power: 3.7VRated power: Speed: 11000RPMOutput speed: .550RPMBattery capacity: 1200mAhWorking time: about 2HoursSize: 143*31*31mmPackage:10 small sand rings 20 pieces of sandpaper.Package List:1 Set Electric Foot Grinder