Hygger mini quartz glass aquarium heater was specially developed for use in small and medium-sized aquariums. This aquarium heater is very safe and durable, made of milky quartz material, can withstand a high temperature of 1800. excellent in explosion-proof and shatterproof. The service life can be more than 3 years when used exclusively in fresh water. There is an LED display on the temperature controller. When the tank heater is heating, the control lamp lights up red. When it stops heating, the lights are off. When does the heating stop and heat up againThe aquarium heater is very reliable to maintain the set water temperature. It stops heating when the water temp reaches the set temperature and starts heating again when the temperature is 1.5-2 C below the set temperature. Overheating protection The aquarium heating switches off automatically as soon as the water temperature is above 97 C. How do I set the temperatureTurn the knob on the temperature controller to set it to the desired temperature. The temperature range is 68-90 . Size Chart Power and tank: 50 W (5-15 gallons) 100 W (10-30 gallons) Length of heater: 12.7 cm 17.8 cm If the room temperature is below 50 C, please buy a heater with a higher wattage. Do's and don'ts 1. For a better aquarium experience and safety, please read the instruction manual carefully and follow it. 2. Keep the aquarium heater completely submerged in water. 3. Glue the heater horizontally or vertically on the tank side near the water inlet or in the water flow. 4. Do not bury the heating element in sand or stones. 5. Please keep the temperature controller away from water. 6. Please close the power supply

Fully SubmersibleThis aquarium heater is waterproof, needs to be completely submerged in water when working, place horizontally or vertically near the water inlet or water flow. Durable quartz glassThis aquarium heating tube is made of heat-resistant quartz glass, excellent in explosion protection, can be used in fresh and marine water aquariums, white aluminum sand as a heat-conducting medium, service life can be 3 years or more. With the built-in thermometeryou can set the temperature from 68 to 90 , the temperature accuracy is within 2 degrees in Fahrenheit. There is a built-in thermometer in the heater to see the water temperature, no need to buy a separate thermometer. Auto stop and restartEffectively keep the tank water at the constant temperature you set, stop heating when the water temperature reaches the set temperature, and start heating again when the water temperature is 1-2 lower than the set temperature The controller lights up red when it is heating, is off when it stops heating. For aquarium 15-35 gallons100W aquarium heater, voltage AC110-120V 60HZ, power cord is 4.6 feet long. The heating rod length is 5 inches, mini compact heater for use in small aquariums. Perfect for Betta tanks. A very compact heater, easy to hide in the tank.