Feature: 1. PID COMPUTER CONTROL SYSTEM: Adjustable aquarium heater adopts PID computer control system, copper wire heating, quartz explosion proof tube, fast heating speed, power saving and safety. 2. DIGITAL LED DISPLAY: Mini fish tank heater adopts LED display to show the set temperature and real time water temperature, with high accuracy temperature probe, high temperature protection. 3. POWER FAILURE MEMORY FUNCTION: Mini aquarium heater has power off memory function, restart after power off, the product will automatically remember the set temperature at the last power off. 4. OVER TEMPERATURE PROTECTION: When the water temperature exceeds 34, the screen will display HH and flash to remind and stop heating, when the water temperature is lower than 15, it will prompt LL, low temperature alarm. 5. WIDE RANGE OF APPLICATION: 15W aquarium heater is widely used, can be used in freshwater, saltwater fish tank, turtle tank, grass tank and other kinds of small tanks and low water turtle tank. Specification: Item Type: Mini Fish Tank Heater Material: Quartz Tube, Plastic Use: Fish Tank Mini Heating Rod Voltage: 100-240V Adjustable Range: Celsius: 15-34 Fahrenheit: 59-9 Applicable Water Volume: Below 4L Power: 15W. Package List: 1 x Mini Fish Tank Heater1 x Plug Adapter1 x Suction Cup