Function: 1. COMPUTER PID CONTROL SYSTEM: Adjustable aquarium heater adopts computer PID control system, copper wire heating, quartz explosion-proof tube, high heating speed, energy saving and safety. 2. LED DIGITAL DISPLAY: The mini aquarium heater adopts LED display to show the set water temperature and temperature in real time, with high accuracy temperature probe, high temperature protection. 3. POWER FAILURE MEMORY FUNCTION: Mini aquarium heater ma shutdown memory function, restart when power off, the product will automatically remember the set temperature when the last power off. 4. TEMPERATURE PROTECTION: When the water temperature exceeds 34℃, HH will appear on the screen and start flashing to remind and stop the heating, when the water temperature drops below 15℃, LL, low temperature alarm will be displayed. 5. WIDE RANGE OF APPLICATIONS: 15W aquarium heater is widely used, it can be used in freshwater aquarium, saltwater aquarium, turtle tank, grass tank and other kinds of small tanks and low water turtle tank. Specification: Item Type: Mini Aquarium Heater Material: Quartz pipe, plastic Application: Mini heating rod for aquarium Voltage: 100-240 V Adjustable range: Celsius: 15-34 ℃ Fahrenheit: 59-9 ℉ Applicable water volume: less than 4 liters Power: 15W List of packages: 1 x Mini aquarium heater 1 x adapter 1 x Suction Cup