HC810 Controller Features: * Precision digital control, maintain water temperature at a constant level * Advanced digital heating control technology with adjustable low/high temperature alert setting *Automatic shut off overheat protection - when the water temperature over the high temperature alert setting value, the alarm will start beeping. The heating process will also be shut off automatically. * LED water temperature reading * Three prongs power receptacle works with Finnex 300W, 500W & 800W heating tubes and other brand's heating elements. Specifications: * Control Range: 0F - 99F * Accuracy: +-2F * Maximum Load: 800W * Over Load Fuse: 10A * Default High Alert: 93F * Default Low Alert: 36F Finnex Heating Elements are constructed from titanium and use premium components to provide precise and reliable heating when paired with our HC-810 Heater Controller.