Controls the Kasco 115V Dock deicers. Turns off the de-icer when the pre-set air temperature is exceeded. Turns it back on when the air temperature falls below the set point. This will save you money particularly if you aren't out by the dock every day to turn off the de-icer when the temperature warms up.
The de-icer plugs into this thermostat which turns the power on or off to the de-icer.
It is easy to install with 4 screws somewhere where it will be the most out of the sun. I put mine on the north side of my dock's support post. It has about a 7 ft. cord, so you must put it that close to a 115V (120V) outlet.
I've had it for only a month, but I don't think I'll have anything bad to say about it at the end of the season.