FND Installed R.P.M is shown on a FND to work easily. Various R.P.M control method R.P.M can be controlled by Hand, Foot and Knee after selecting button Hand, Foot/Knee. Self Diagnosis & Reset function It diagnoses by itself and shows Error Code (ER) in the FND when it is breakdown and malfunction and turn the power off and then on again after solving the problem to re-operate this power unit. Feedback function Provide same power to the handpiece at low speed, so it is offered maximum Torque in all R.P.M. Excellent durability Spindle is designed prevent dirt and carbon powder. Bur exchange easily NH1: Using Cam way. Handle can be twisted easily and exchange burrs easily. NH3 Handpiece is designed European grip. Handle can be twisted smoothly due to the installed ball in the inside of handle. Special ball bearing installed Special ball bearings are installed. It brings less heat and low noise for operation. Bearing can be long used.