hygger 200W Submersible Aquarium Betta Heater with Digital LED Display Temperature Controller, Small Fish Tank for Freshwater & Saltwater up to 80-120L

【Small Yet Powerful】This 200W aquarium heater measures just 7.6 inches, ideal for 80-120L (21–32 gallon) tanks. Red light indicates heating; green light means constant temperature. Suitable for marine, saltwater, freshwater, fish, turtle, and betta tanks as well as small ponds. Please select the correct wattage using our size guide 【External Digital Controller】Adjust temperatures via an external controller without getting hands wet or disturbing tank water. Adjustable range: 15–34°C (59–93°F). The display shows both current and target temperatures, and you can switch settings easily with one press. No separate thermometer is needed 【Overheat Protection & Memory Function】The unit shuts off and flashes “EE” if water temperature exceeds 35°C (95℉) to prevent overheating. It also saves your last temperature setting; after a power outage, it restarts with your original preferences automatically 【Dry-Run Protection】The aquarium heater automatically stops heating and flashes “Er” when lifted out of water. It resumes operation immediately once fully submerged, providing reliable safety for daily use 【Durable & Efficient Heating】Made of shatter-resistant quartz glass, this fish tank heater is safe and long-lasting. The high-efficiency nickel-chromium heating element and silicon carbide conduction deliver consistent, even heating while maximizing energy use