Temperature Range: set temperature 18-34degrees/64.4°F-93.2°F Celsius arbitrary setting,automatic constant temperature, automatically shuts down when the temperature exceeds 36°C/96.8°F Intelligent Temperature Control: Automatic constant temperature function, when water temperature reaches to specified temperature value, heater will automatically stop heating, when water temperature is lower than the set temperature, heater will automatically start heating. Furthermore, Automatic safety shut-off feature, and overheating protection. Note: adjustment accuracy is 0.5°C or 1°F, and the display accuracy is 0.1°C Applicable Scene: Suitable for fresh water tank,marine tank,reef tank,tortoise tank,hydroponics, pet water feeder etc. Funcational: Power: 10W, for 1-3L/0.26-0.79gallon fish tank, power: 20W, for 4-6L/1.06-1.59gallons fish tank Specification: Material: ABS , Quartz Glass Color: Black Size:5.5x2cm/2.17x0.79inch EU Adapter Size Chart: Usage: After switching on the power supply, put the heating rod tube into the water, the controller display screen shows 88.8, and then the display screen shows the temperature set last time. After 3 seconds, the controller displays the currently detected water temperature. The display displays the last set temperature. Press once to increase the temperature by 0.5°C/1°F Then automatically save the current temperature value. When the real-time water temperature is lower than the set temperature 0.1°C, the temperature control state is entered, and the green light is on. When the real-time water temperature is lower than the set temperature 0.5°C, it enters the heating state and the red light is on for heating. Package Includes: 1 Piece Aquarium Heater