Product description Specifications: 50W, 100W, 300W Size: 50W length 20.5cm, 100W length 26.5cm, 300W length 30.5cm Color: Black Material: Glass Package content: 1 piece fish tank heating rod Application Suitable for freshwater and marine aquariums, Betta tanks, frog enclosures, newt habitats, turtle tanks, aquaculture setups, glass containers, and hydroponic systems. Intelligent temperature control Features automatic constant temperature function. When the water temperature reaches the set value, the heater automatically turns off (LED off). When the temperature drops below the target, the heater automatically resumes heating (LED on). Warm tips This heater is fully submersible and constructed of shatter-resistant quartz glass. Includes automatic safety shut-off to prevent overheating. Easy installation Ensure the thermometer is fully submerged in water for several minutes. The temperature controller is adjustable from 59F to 95F. Press the set button to adjust to your desired temperature; the heater will begin operation automatically. Place the heating rod near the water outlet and ensure it is completely immersed in water. Easy to use Adjust the temperature knob easily to set your preferred temperature. Made with 2mm thickened quartz glass, suitable for both freshwater and saltwater aquariums.