Stepless Speed Adjustable Nail Drill: The professional nail file with advanced stepless speed technology spins up to 30,000 RPM, allowing you to customize the speed of the nail drill to meet your different nail care needs for nail trimming, grinding, polishing, etc. Long-Lasting Battery Life: With a fast charging time of only 1.5 hours, the SM220G provides an impressive 6-8 hours of continuous use. Perfect for extended sessions at home or in a professional salon, it ensures you never run out of power when needed. Convenient Pause Function: The SM220G has a dedicated pause button located at the top of the nail drill, allowing you to quickly stop and resume operation.