There is only one U-Power 200 electric nail file system! At Kupa, we pioneered the safe method of using electric motors to sculpt beautiful nails. The U-Power 200 is the finest nail-filing machine available. THE U-Power has a powerful micro-motor hand piece constructed of durable stainless steel, with sealed bearings that make it unbelievably smooth and quiet when operating. The handpiece quick release function allows you to change bits with the twist of a wrist. The power source operates on standard 110 volts AC. The speed control occupies about 5 square inches of tabletop and allows the user to easily adjust the operating speed from 0 to 20,000 R.P.M. simply by sliding the control lever side to side. The Speed control also gives the operator the option running the motor forward for right handed users or in reverse for let handed users. Every U-Power 200 has a six-month warranty covering defective part of workmanship.