Yofoths Adjustable Mini Aquarium Heater 0.5/1/2/3 Gallon Submersible Small Fish Tank Heater 10W/20W/30W Digital Display Thermostat External Temperature Controller

Mini and Accurate It heats at a more accurate temperature and at the same time it doesn't take up space! External Digital Controller Easy to operate, button adjustment, no need to wet your hands when the temperature is adjusted.Built-in temperature sensor, The water temperature is directly displayed on the LED display screen, which is more intuitive. Upgraded Chip Although I look like others, my chip is different. It can respond quickly and accurately after sensing the water temperature. Operation: Press the SET button to adjust the target temperature, press once to increase by 1°F, the target temperature can be set in the range of 64-93°F. External controller is not waterproof. Press and hold 'SET' button, power on the heater, and then release the button, the temperature unit will be changed between C and F. Cautions: When there is moss or other dirt on the heater surface and LED screen, it needs to be cleaned with a soft brush in time. Disconnect the power outlet and wait 15 minutes before changing the water or removing the heater. Put the fish tank heater in the water, don't bury it. If the ambient temperature is very low, you need to choose a more powerful heater or use 2 heaters. If the water temperature is lower than the ambient temperature, the number will decrease when the heater is just put in the water. Please wait a few hours, the temperature will increase slowly as the power of the heater is too small. Protection: Code'E1'-Out of Water Protection When the fish tank heater is not fully submerged, the controller will display an 'E1' error code and stop heating. When fully submerged again, the error code will disappear and the heater will start working. Code'H1'-Overheating Protection When the water temperature exceeds 95°F, the heater will automatically cut off the power and stop heating and display the 'H1' error code. When the water temperature is lower than 93°F, the error code disappears and the heater is in working condition.