Q-See QSD6204 - Manual (Page 17)

1. Camera Setup
There are 4 cameras that can be connected to the DVR. Use the key buttons on the
front panel to select which cameras are turned ON or OFF for real-time viewing on
the screen, change ON/OFF by pressing the ‘SELECT’ button.
In the example above, cameras 1,2,3,4 are ON.
-14-