25W Aquarium Heater: The aquarium heater features a fully submersible waterproof design to maintain the set temperature precisely and safely. Operating power: 25W, size: 195mm x 25mm. The aquarium heater is suitable for small aquariums, recommended for aquariums with a size of up to 30L. Safe and durable: This aquarium heating rod is made of high quality quartz glass. 2mm thick and made of double waterproof components, 33% thicker than normal 1.5mm aquarium heater glass, double sealed, explosion-proof, shatterproof and IP68 wash-proof. NOTE: When changing the water in the aquarium, please turn off the power ten minutes in advance and then change the water. Adjustable temperature: The adjustable temperature display range is From 20C to 34C (68F to 93F), on the front of the driver is an easy-to-read temperature scale. The rotary knob on the top can adjust the desired aquarium temperature on the scale. Precise temperature regulation: The aquarium heating bar has a high-resistance heating wire and a built-in thermostat to automatically maintain the water at the set temperature within +/- 1F (1C) error, the "ON" light in the middle allows you to clearly see if the product is working properly, ensures proper water temperature sufficient and stable water for your beloved fish. Easy to install, with 2 powerful suction cups, you can put it at any angle, please soak the heater completely in water. This 25W aquarium heater is suitable for up to 30 liters of water, both fresh and salt water. Intelligent constant temperature heating, providing your fish with a safer and more comfortable environment.