S483B1002 : Resideo Honeywell Winter Watchman Freeze Warning Device, Vertical Mount, Beige

Resideo Honeywell S483B1002 Winter Watchman is often used as a freeze warning device. This Thermostat Completes a circuit to a household lamp on temperature fall, indicating inoperative heating equipment.

Features:
Plugs directly into wall outlet.
Lamp plugs into receptacle at bottom of Winter Watchman device.
Useful when house is unoccupied to notify a neighbor of a temperature drop so heating source fault can be rectified before freeze-up occurs.
Not precision calibrated for use as a thermostat.