The features of ROOT-PI Apex Locater（Basic type）: 1. The machine can obtain accurate reading when the root-canal is moist, but without sodium hypochlorite, hydrogen peroxide, saliva, blood or pulp. 　　2. This kind of machine has LCD screen showing the scale and figure, transmitting the information about the length of the root-canal accurately and clearly. 　　3. Equipped with voice control alarm facility for caution at any time. More convenient for the consumers. 　　4. It is simple and easy to operate this machine high-efficiently, with accurate reading. No X-ray radiation. 　　5. Equipped with high-energy rechargeable battery, which can be used for ten years, cutting the cost. SPECIFICATION a). AC supply: 220VAC+10% 50/60HZ b) Rated power: <0.36W c). Equipment class: Class II (Medical Appliance Classification Catalog) d). Protection from electric shock: Type BF (Medical Appliance Classification Catalog) e). Protection from ingress of liquids: None f). battery: 7.2V, 700mAh g). Pulse frequency: 300Hz+10% Output pulse width: 3ms+30%