Features: - 24V DC motor for chair (safety system). - Auto spittoon flushing and cup filler control system. - 3 programs inter-lock control system (Integrated circuit board / USB cable connection). - Down-mounted Instrument tray (with air break/interlock). - Water / air / electric master switch. - Handpiece holder / assistant rack quick connection hose. - Glass spittoon (Detachable) Double articulate headrest. - Seamless cushion (PU). - Round foot switch. - 4-way joystick (control patient chair go up/down/front/back). - High suction and saliva ejector system. - Outer water tank. - LED-13 Operating Light (adjustable color temperature/illuminance). - LED film viewer 3-way syringe (hot/cold). - External/built-in floor box. - ST-301 doctor stool. Technical Specifications: - Power Requirements: AC 220V, 50Hz/60Hz, 400VA, grounding. - Air Requirements: pressure 0.6-0.8MPa, volumes＞80L/min. - Water Requirements: pressure ≧0.2MPa, volumes＞10L/min.