25W Small Submersible Heater: Suitable for 1-5 gallon fish tank; Temperature Control Range 59℉-93℉; When the temperature is lower than the set value 1℉, the heater automatically heat up; Automatically stop heating when the set temperature is reached
External Controller and Built-in Thermometer: Fish tank heater with a built-in thermometer, display water temperature of the fish tank in real time; HD LED display, the red light when heating, red light off when the temperature is constant, and display error code when the heater fault; The controller is not waterproof, please do not put it into water
Easy To Use: Set temperature by press the button until reach your desired temperature value; The display will flash the desired temperature value three times, then return displaying the current water temperature, setting is done; You can press the button persistently to display 59-93℉ in a cycle

Beep Alarm, Fault Prompt: Our nano aquarium heater has safety features such as low water level shutdown and overheat protection. When the temp control system detects a malfunction in the equipment, it will give an error code alarm and stop heating to prevent any potential damage or injury. Note: Although the system will automatically turn off the power when a malfunction occurs, residual heat in the heating rod may melt the shell. Please handle it as soon as possible
Black Look & Mini Size To Hide Easily: The 50-watt Betta heater with a 4″ long x 1″ high heating element design takes up very little space, which could effortlessly fit into 5-10 gallon small aquariums and is also suited for shallow water turtle tanks
Adjustable Temperature Control: hygger mini submersible heater includes an external thermostatic temperature controller, you can easily set the temperature by cycling between 59 and 93 degrees, and the digital display makes for intuitive viewing of real-time water temperature. Once the heater is on, an indicator light will tell you whether it is in heating mode or on standby