High Speed up to 30000RPM: This professional nail drill is equipped with high-quality bearing, which enables it work smoothly at a high and adjustable speed (0-30000 RPM). Top Quality Torque: This E-file comes with superior torque to avoid it from stopping occasionally during work. Awesome for nail buffing, filing the shape of various nails, and smoothing calluses or hardened skin on your hands and feet. Rechargeable and Cordless: With a large battery capacity (4000mAh), you can use this nail drill at anywhere anytime. Being fully charged for about 3 hours, the electric nail file will work 8-12 hours. Portable Design: A Belt clip of the body case allows you to hang it on your belt on the waist and it is compact enough to pack into the traveling bag.