The HMX series carries updates over previous Finnex Titanium Heater lines. The HMX series sports a sleek and modernized black control face that easily controlled via its precision touch pad. Corrosion-resistant, fast heating titanium tube is engulfed with well fitted heater guard to ensure the safety of one's aquatic inhabitants and surrounding equipment. Maintains Water Temperature within +/-2º F of the setting value. Memory Chip to restore previous settings. Fused technology to create a precision digital control that maintains water temperatures at a constant level. In case of a power failure, heaters are equipped with memory to bring you tank back to it's original settings without any unfortunate mishaps upon power return.