Ergonomic design easy to carry 2. With LED lamp and high brightness, it can help doctors get a better look at the root canal environment. Built-in high-capacity lithium battery, so it can reduce battery change times and reduce costs for machine. Dental contra-angle Handpiece and lamp holder can withstand 135°C high temperature and high pressure sterilization. 5.9 types preset programma 6.16:1 standard configuration contra angle 7. Soft start and soft stop can be achieved and the operation is more comfortable. Simultaneously, it will not break the needle when root canal files encounter instantaneous shock. Main engine Voltage: 3.7Vdc Battery capacity: 950mAh Charger input voltage: AC110-220V, 50/60Hz Charger output voltage:5Vdc input voltage: 1A. For dental Engine Use. Specific models are as follows. SX 19MM (Blade length): Engine use Shaping Files. S1 25MM (Blade length): Engine use shaping files. S2 25MM (Blade length): Engine use shaping files. F1 25MM (Blade length): Engine use finishing files. F2 25MM (Blade length): Engine use Finishing files. F3 25MM (Blade length): Engine use finishing files.