Thermostat control outlet with the smart indicator light: The indicator light turns on when it's below 38 and it has energized the outlet.

Energize below 38℉(3℃) and to turn off automatically at approximately 50℉(10℃). Automatically turns power on and off according to ambient temperature. Save energy and save money

Easy installation: just plug this device into electrical outlet. Maximum 15 amps. CSA approved. Only for dry location.

Can be use for other applications: 120 VAC electric heaters, gas heater, Engine heaters, pipe heat tape, roof heating cable and so on

Make a test when you received the product.  Put it into the freezer for 45 minutes.  And then plug in and you will see the red light on the thermostat control. Two year limited warranty- If you are not completely satisfied with HEATIT ET-21, please don't hesitate to contact us in any time, we'll try our best to solve your issues.