Features: [Mini Aquarium Heater] This small aquarium heater is only 5cm (1.97 inches) in length, takes up less space, and is easy to hide in the fish tank. The temperature range of the American Fahrenheit model is 64~93F, and the temperature range of the English Celsius model is 18~34C. Please purchase according to your needs._x000D_ _x000D_ [USB Powered Tank Heater] This heater is powered by a 5V/2A USB power supply, which is very safe. No need to worry about the fish getting electrocuted. Please use a 5V/2A power adapter (not included) or a 5V/2A power bank (not included) to power the heater._x000D_ _x000D_ [Precise Temperature Display] Using smart inverter technology, this thermostat maintains the heater at a constant temperature through a built-in chip, which is more precise than knob control of the heater, and the display is easy to read the temperature._x000D_ _x000D_ [Overheating Protection and Power-off Memory Function] When the water temperature exceeds the maximum temperature range, the fish tank heater will stop working. The heater will remember the temperature setting, and in the event of a power outage, when the power is restored, the heater will follow the last setting._x000D_ _x000D_ [Widely Used] This fish tank heater is very suitable for small fish tanks of 1~5L. Can be used in fresh and sea water, it can be used not only as an aquarium heater, but also for turtles, pet fountains and plant seedlings. _x000D_ Specification: Name: Fish Tank Heater_x000D_ Material: ABS, heating element_x000D_ Size: The length of the heating rod is about 5cm, the length of the lead from the USB interface to the switch is about 30cm, and the length of the wire from the switch to the heating rod is about 100cm_x000D_ Power: 10W_x000D_ Style(optional): US Fahrenheit, English Celsius Package includes 1 x Fish Tank Heater _x000D_