No overheating, no electric shock! The mini fish tank water heater is equipped with an integrated thermal protection circuitry to prevent any overheating, it will turn off automatic when water temperature get to what you were setting, and begin to work after several minute when temperature lower setting temperature. Aquarium heater is an essential item if you keep tropical, warm water fish in your tank. The heater will keep your tank at a steady and controlled temperature. Correct Temperature range is very important for fish and other living organisms in the tank. Energy saving, and indicator light! The power of this thermostatic aquarium heater is 100 W, low energy consumption, which is good for 20 gallon fish tank. When heater is heating, the indicator light will be red, and when it stop working, the light will be off. Mini size and practical suction cup! The size of this glass submersible heater is 9.8*1 inches, which is small to hide in fish tank decor. Two suction cups make it easy to hold on the fish tank wall, space saving. Note:! After receiving the heater, please kindly check the glass part if there are any crack on it, if find the glass crack, is because defect on the shipping way, please don't use, just tell us, we will resend you free replacement without any question. 2: Setting a proper temperature before put into aquarium. 3: Don't turn on when it is outside water, because dry burning may lead to work abnormal. 4: Must be full submersible into water, don't leave half heater out of water. 5:Don't bury into to sand. Specification: Power: 100W, suggest using it for 20 gal fish tank Voltage: 110 V-120 V / 50Hz Size: 9.8 *1 inch Temperature range: 20°~34°C(65° F - 93° F) Package include: 1: 1 Aquarium Heater 2: 2 Suction Cups
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