【Dual Temp Control Aquarium Heater】The aquarium heater controller is equipped with a built-in high-precision IC intelligent chip and PID monitoring system, the temperature control range is from 63 to 94℉ (17 to 34℃), enabling real-time monitoring water temperature in the aquarium and automatic temperature regulation. The controller features a large display, with a green surround light indicating constant temperature and a red surround light indicating heating 【Faster Heating Fish Tank Heater】This 300W aquarium heater is suitable for fish or turtle tanks ranging from 20 to 75 gallons. Featuring a double tube design, it utilizes high hardness nichrome wire with quartz sand heating material, achieving a remarkable 20% higher heat conduction efficiency compared to traditional single tube aquarium heaters. It comes with UL-1018 certification, guaranteeing impeccable explosion-proof performance while providing stable heating. 【Overheating & Water Loss Protection】 This aquarium heater has a unique intelligent temperature water sensing system, when the heater is completely out of water, the controller will display E1, or beyond the maximum temperature value 94℉ or 34℃, the controller will display HH blinking + alarm, in both cases the heater will automatically stop heating and the surround light will turn green to ensure the maximum safety of you and your aquatic pets. 【All-around Protective Submersible Aquarium Heater】This aquarium heater comes with UL-1018 test report, tested and certified by professional team, the heating shell is made of ABS hard plastic, 0.4cm cooling holes to prevent small fish from drilling in, all-around protection for the safety of your aquatic pets! 【Suitable for All Types of Tanks】This fish tank heater is equipped with IPX8 waterproof to eliminate power leakage. With 3 strong suction cups, one button installation. Perfect for saltwater tanks, freshwater tanks, turtle tanks, aquarium markets, please choose the right size before buying! We offer a 12-month warranty, if you have any questions, we are 24 hours online for you. HiTauing Aquarium Heater 300W/500W/800W/1000W, Fish Tank Heater with Smart IC Chip & PID System Controller, Accurate Temp Control Heater for Saltwater and Freshwater