A、Glass aquarium heater with temperature adjustment and digital display function. B、Input voltage: 120Vac ±10% Frequency: 60Hz C、Waterproof grade: IP68 D、Temperature tolerances: ±2F (1.1℃), Temperature accuracy: ±1F (0.55℃). E、Temperature display: Fahrenheit (F) and Celsius (℃),Fahrenheit (F) and Celsius (℃) can switch to each other by long pressing the temperature button for 3 seconds. F、Temperature range: Celsius: 18-34°C Fahrenheit: 64-94F G、 Temperature adjustment: The desired temperature will increase 1℃ each time when press the button on the top. The digital display will automatically return to display the current water temperature if stop pressing button for 3 seconds.The temperature can only be adjusted from 18 degrees( minimum)to 34 degrees (maximum). If over 34 degrees, it will return to begin with 18 degrees. H、 Work indicator: The red light will turn on when heating. The green light will turn on when heating stops. If there is an error,the red and green lights will trun on at the same time in 1 second. I 、Power off when leave from water: If the lowest water level line of the heater is not immersed in water, the heating system does not work.