The VCR-1 is a high quality solution box which design for a control signal make for it can base on the absence or presence of valid video signals. This appliance can provide normally-open and normally- close contact and when the valid video is being detected; the LED on front panel will be lights. The VCR-1 can detect signals as weak as 0.5 V pp and the relay contacts close when a valid signal is detected. There also has input and output connector used video jack, it can connect to other appearances easily. The VCR-1 can supply a terminator which may be installed at the end of a video line by installing a terminator 75 ohm to the out video jack.