URC Total Control MRX-4SEN2 Owner's Manual page 7

Bottom Panel
The bottom panel consists of:
The serial number, located at the bottom of
the unit, uniquely identifies the product.
The MAC Address (12 numbers) identifies this
device when connected to the network.
Functions with other wireless devices
(routers, wireless access points, etc.) to provide a simplified method
of connection to the network. Press this button in conjunction with
the WPS button found on your other wireless devices to establish
a connection.
Turns the unit OFF then ON again and reconnects to
the network.
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