"Product Description Specifications: 50W Size: 50W Length 20.5cm Colour: Black Material: Glass Package Contents: 1 x Aquarium Heating Rod< br />1.ApplicationApplicable for Freshwater and Marine Aquariums, Betta, Frogs, Newts, Turtles, Aquaculture, Glass Vessels and Hydroponic Systems 2.Intelligent Control temperatureAutomatic constant temperature function, when the water temperature reaches the specified temperature value, the heater will automatically shut down (LED off), when lower than the target temperature, the heater will automatically start to heat up (LED on). 3.Warm TipsThis heater is fully submersible, constructed of shatterproof quartz glass and features an automatic safety shut-off to prevent overheating. 4. EASY INSTALLATIONMake sure the thermometer is completely submerged under water for a few minutes, the temperature controller is adjustable from 59-95F, just press the adjustment button at the set temperature, it starts working . please place the heat rod into the water outlet and fully immerse it in water. 5.Easy to UseYou can adjust the temperature knob to adjust the temperature you want easily, 2mm thickened quartz glass, can be used in freshwater and saltwater aquariums " Note: The data is all manual measurement, please allow 1-3cm error; due to the difference in light and display, there would be a certain color difference, please refer to the actual item received.