English: Product Description Specifications: 50W, 100W, 300W Size: 50W length 20.5cm, 100W length 26.5cm, 300W length 30.5cm Color: Black Material: glass Package Contents: 1 Piece Fish Tank Heating Rod 1. [Application] Applicable for freshwater and marine aquariums, Betta, frogs, newts, turtles, aquaculture, glass containers and hydroponic systems 2. [Intelligent Temperature Control]: Automatic constant temperature function, when the water temperature reaches the specified temperature value, the heater will automatically shut off (LED off), when it is lower than the target temperature, the heater will automatically start heating (LED on). 3. [Helpful Tips] This heater is fully submersible, constructed of shatter-resistant quartz glass, and features an automatic safety shut-off to prevent overheating. 4. [EASY INSTALLATION]Please make sure the thermometer is fully submerged underwater for minutes, the temperature controller is adjustable from 59-95F, just press the setting button to the set temperature, it starts working. Put the heating rod into the water outlet and immerse it fully into the water. 5. [Easy to Use]You can adjust the temperature knob to set the temperature you want easily, 2mm thickened quartz glass, can be used in freshwater and saltwater aquariums.