The HITOP 25W Adjustable Aquarium Heater is a submersible water heater designed to maintain a constant temperature in your fish tank. Crafted from ceramic and glass, it's a durable addition to your aquatic setup. The sleek design measures 7.8 x 1 x 1 inches and is designed to be fully submerged in water for optimal performance. This heater is perfect for adult users looking to create a comfortable environment for their fish. With a 25W size that's ideal for smaller to medium-sized aquariums, it promises to be an efficient heater that's easy to use. The product is manufactured by IBAY and is designed with the specific use of heating water in a fish tank in mind.