【Simplify the controller+Extra long temperature control range】Adjustable temp setting between 59°F to 93°F in 1-degree increments.Each time the controller button is pressed, the set value increases by 1℉. Press and hold the button for 1 second to enter the continuous addition setting. After the button is not operated for 3 seconds, it will automatically exit the temp setting. 【LED DIGITAL DISPLAY】 The built-in LED display shows the real-time Water Temp and Power, and the temp is accurate to ±0.1°F; when the water temp reaches the set temp value, the heater will stop heating, and Power is displayed as 0.Beeping alert system when heater use in a wrong way. 【Intelligent frequency conversion thermostat】Based on Japan Renesas chipset, , When the water temp in the fish tank is 1℉ lower than the set temp, the heater will output the maximum power. When the water temp is 0.1~0.9℉ lower than the set temp, the heater will switch to the frequency conversion constant temp mode to work. Compared with ordinary heater, it can save one-third of the electricity bill. 【Dual sensor mode】If one of the two sensors is damaged, the display will display E1, and the heater will stop working. Although there is still one sensor that can work, it will increase the risk of "cooking fish". When an error code appears indicating 'E1', please contact us for after-sales service.500 WATT aquarium heater is recommended for 60-120 gallon freshwater aquariums. 【SAFE 】 Beeping alert system will work when heater use in a wrong way. Submersible Aquarium Heater is constructed of explosion- proof titanium and The Plastic guard which prevents fish from coming into contact with the heating and prevent burnout. Titanium Steel Aquarium Heater for Fresh Water