Easy to read temperature: The mini adjustable aquarium heater is equipped with a real-time LED water temperature display. Temperature sensors make temperature measurements more accurate. No need to buy a thermometer to measure the temperature anymore, bring visible thermal comfort to your aquarium. Safety protection: The adjustable mini aquarium heater has an overheating protection mechanism. When the water is overheated or the water heater leaves the water, the water heater automatically cuts off the power supply and stops working. Brings warmth to the aquarium while protecting your hands and your fish. Let you buy with confidence and use with peace of mind. Protective shell: The small aquarium heater has a thickened plastic protective shell, anti-scalding and explosion-proof, impact-resistant , corrosion-resistant, cost-effective and good quality. It is durable and protects the safety of aquatic life. Suitable for freshwater, saltwater and aquarium aquariums. External controller: The aquarium control heater has an external controller, the temperature can be easily controlled on the controller, every time you adjust the temperature, just press the button and you can get the desired temperature. Easy to use: The small aquarium heater is equipped with a suction cup base, which can be stably and firmly attached to the side wall of the aquarium, giving aquatic creatures more space to move.