FEATURES: This Electric Foot File and Callus Remover has 2 speeds: 1700 RPM/min and 2000 RPM/min. You can choose the right amount of pressure depending on your targeted areas. It is equipped with a high quality 1200mAh large capacity lithium battery has overcharge protection function a battery display function. It can help you know how much rest of power of the battery and when should be charged. USB charging time is usually 3hours; it can work about 90 mins continuously. The electric foot file has waterproof design. You can use it to make a perfect foot care for your feet when you get out of the shower. It is recommended to dry your feet before use, and then use it for better results. Note: Do not soak it in water for a long time. This electric callus remover has 3 different quartz sand roller heads. Rough roller head for remover stubborn dead skin, medium roller head for remover rough dead skin and fine roller for daily foot care. You can choose suitable roller head according yourself skin to foot care, making your skin restore its delicate and smooth appearance. Note: Do not soak it in water. SPECIFICATION: Color: Blue, White Material: ABS, PC Size: 16.5 X 6.5 X 3.5CM Weight: 300g Functions: Callus Remover Usage Time: 90 mins Charging Time: 3 hours Battery Information: 1200mAh Power: 3W Gears: 2 Voltage: 5V 1A Product PACKAGE INCLUSION: 1 X Electric Portable Foot Care File and Callus Remover 1 X Fine Head 1 X Coarse Head 1 X Medium Head 1 X Cleaning Brush 1 X USB Charging Cable