Roof Sentry RS2 is a residential roof and gutter de-icing control. This unit automatically controls operation and energy usage of electric roof deicing cable. The RS2 requires two conditions to be present before it energizes roof deicing cable: both cold temperatures (on, 38 degrees F; off, 48 degrees F) and the presence of run-off water from the roof in contact with its sensor wire. If only one of these conditions exists, the control will not energize the cable. The control is rated at 10 amps at 120 VAC, and requires one per cable. It is CSA certified.