Specifications: 50W, Size: 20.5cm Length, Color: Black, Material: Glass Package Contents: 1 x Aquarium Heating Rod 1. Application: Suitable for freshwater and marine aquariums, betta fish, frogs, newts, turtles, aquaculture, glass vessels, and hydroponic systems. 2. 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 set point, the heater automatically resumes heating (LED on). 3. Safety Design: Fully submersible construction with shatterproof quartz glass. Includes automatic safety shut-off to prevent overheating. 4. Easy Installation: Ensure the heater is fully submerged in water. The temperature controller is adjustable from 59°F to 95°F. Press the adjustment button to set the desired temperature. Place the heating rod in the water flow and fully immerse it before use. 5. User-Friendly Operation: Adjustable temperature knob allows easy setting of desired temperature. Made with 2mm thickened quartz glass, suitable for both freshwater and saltwater aquariums. Note: All measurements are manually taken; please allow 1-3cm variation. Due to differences in lighting and display settings, actual color may vary slightly from the image. Refer to the physical product received for final details.