Finnex HMA 300w Electronic Controller Aquarium Heater Titanium Tube Heater Guard systems You can set up text 317163128565 You can set up text message alerts and or emails to be notified if a pump is blocked or disconnected The unit comes with the "ATC" suffix which is equipped with "Automatic Temperature Compensation" for accurate measurements without recalibration after shifts in ambient working temperature (field use) The Finnex Compact Electronic Titanium Heaters maintain water temperature within + 2ºF of the set value providing a safe These ultra fast heating tubes are easy to hide as they are compact in size and also include a precise electronic control with hang on hook