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) by rotating the speed control knob easily. It is an ideal file for both professional technicians in salon and newbies who start their journey to nail beauty at home. Top Quality Torque: The efile comes with superior torque to avoid it from stopping occasionally when applying appropriate pressure. Rechargeable and Cordless: With a large battery capacity(2000mA), you can use this nail drill at anywhere anytime. Being fully charged for about 2-2.5 hours, the electric nail file will work up to 10 hours. The smart LCD screen will display the precious RPM and electricity.