1.The main technical specifications: 1.1 Battery: 3.7V/2000mAh 1.2 Adapter: ~100V-240V 50Hz/60Hz 1.3 Consumption power: ≤0.5W 1.4 Screen: 4.5' LCD 1.5 Buzzer alert: The buzzer will alert when the file is less than 2mm closed to the apex. 1.6 Operation conditionAdvantage: a) Environment temperature: 0~40ºC b) Relative humidity: 10~85%RH. c) Atmosphere pressure: 60kPa~106kPa 2.Advantage: 2.1.Accuracy:America made high quality chip,digital measurement andmulti-frequencymeasuringtechnology. Clinical practices showed that our accuracy is the same to company D from USA, company V from Germany and company N from Japan. 2.2.Anti-interference, measuring results is not affected by different kinds of teeth or root canal environment. 2.3.Rechargeable lithium battery with high capacity, standby time can up to 6 months, which is much more longer than NI-MH battery being used by some other companies. 2.4.Large colored display, visual angle can be adjusted flexible. 2.5.Integral panel with touch inductive buttons, easy to clean and prevent cross infection.