Figure 5 - Multiple Monitor Connection - ADEMCO AMM12 Installation And Operating Instructions Manual

12-Inch B&W Monitor
If you plan to loop the video out to another monitor, connect a cable to the
Video Out BNC and route it to the Video In of the second monitor. Up to
three monitors can be connected using the loop-through feature.
Figure 5 – Multiple monitor connection
Connect the power cord to the power outlet.
AMM12 5