The Famous ICE ZAPPER One of the most universal and easiest to install dish heaters on the market! Tested in cold Minnesota winters, the Original Ice Zapper with temperature sensor effectively clears snow and ice so you don't have to. The automatic On/Off with built-in temperature sensor kicks the heater on as the temperature drops and then turns it back off when the temperature warms up. Our NEW and IMPROVED Ice Zapper features a more sensitive thermostat that comes on quicker in cold weather and more advanced weather protection around the thermostat. Works on all smaller dishes - 18" to 40" metal satellite dishes and is simple to install installs on the back of your dish in minutes. Quality built in the U.S.A. and backed by a one year warranty. And because it mounts to the back of your dish, it won't interfere with your signal.