URC Total Control MRX-4SEN2 Owner's Manual page 8

Before proceeding, a Custom Professional is required to install
and configure you MRX-4SEN2.
Connect the 3.5mm sensor plug to the rear of the MRX-4SEN2. When a
change in the sensor's state is detected, the MRX-4SEN2 sends a signal
to the MRX Advanced System Controller and triggers a series of
commands.
The example below showcases a voltage sensor connected to the home's
doorbell and the MRX-4SEN2. Whenever the doorbell is pressed, a signal
is sent over the network (wired or wireless) to the MRX Advanced System
Controller. The MRX unit, previously programmed by the Custom
Professional, triggers a series of commands or an event to gain your
attention. A programmed event, such as Watch Movie/TV, may pause the
movie, mute the audio, and display the front door's video camera.
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