Power supply: 220VAC 50Hz Motor Voltage: 24VDC Lighting Bulb: 25W/220V Consumption in Stand-by: ≤7W Protectionh Class: IP20 Ambient Temperature: -30C--60C Operation Speed: 12cm/s Radio Frequency: 433.92MHz Motor output torque: 12Nm Max lift height: 4.2m Max square metre: 18 square metre Function Introduction: Mechanical limit switch for opening and closing door. In power failure, the closed door is auto-locked. Auto-closing function can be enabled. The door can be opened by pulling down the rope fixed on the guide track if power failure. Interface for photocell and backup battery are fixed on the main unit for you to choose. The sliding block has recivered national patent.