1. Working Voltage: AC20~40V 2. RatedCurrent: 1.8A (max 4A) 3. Working Temperature: -40～85℃ 4. Working Humidity: max 85％ 5. Size: controller PCBA 110*60*15mm, power supply PCBA 110*55*30mm 6. Protection: low voltage, over current, over temperature, block 7. VR speed regulation, speed closed loop control (speed regulation from 125~625RPM, speed error 8. Start/stop control, CW/CCW control, control switch between pedal and manual operation 9. Automatic CCW or stop at root tip position 10. Automatic speed reduction at root tip position 11. LCD display 12. Application: tooth repair