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7" Video Door Phone System RFID Unlock Function *** Connect Electric Lock / Magnetic Lock / Bolt Lock / Strike Lock etc, Need Power Supply Control,It\' s Already Included *** Power Supply Control: This AC110V--240V Power supply controller is a transformer which provides stable output voltage for access controller, lock, and exit button. Can reduce the load of access controller, save wiring to reduce the hidden trouble Set NC / NO outputs, can control various types of electric locks Based delay control circuit, lock time can be in 0-15 seconds The circuit board has remote control port. Input Voltage: AC 1 10~220V 50~60Hz Output Voltage: DC 12V 3A Video door phone is a video intercom system, which allows you can see and talk to the