[Features] [ Intelligent Temperature Control ] Aquarium Heater can stop heating automatically when the set temperature is reached, keeping the water temperature constant, the operating frequency will vary depending on the temperature. [ Temperature Memory Function ] Will keep the temperature settings until it powers on again, Fish Tank Heater features a double built-in temperature sensor design, and the water temperature will be displayed on the external temperature controller in real-time. [ Automatic Shut-Off Function ] If the heater overheats, the power will be cut off automatically, Submersible Aquarium Heater is easy to install and use, protecting your fish or aquatic pets. [ Vast Application ] Can effectively protect the fish from scalding, Small Aquarium Heater is suitable for fish tanks, mini aquarium tanks, turtle basins, pet drinking fountains, and other occasions, high-temperature resistant and durable. [product information] product name:Fish tank heater color:black Material:Nickel-chrome wire size:50*25mm Packing list (you can get after purchasing one item): Fish tank heater*1 Please understand: 1. Due to the long shipping time, the item may be damaged during the shipping process, if the item is damaged, please leave us a message through the official website immediately before posting comments, and I will solve the problem for you. 2. Due to manual measurement, the size may have an error of 1-3cm. 3. Colors may vary from monitor to monitor.