1、Mini Heater: The fish tank heater is small, the length is 12.5cm, the diameter is 1.8cm. 2、High Quality: The aquarium heater is made of high quality quartz , double seal material, advanced design, ensures safe operation. 3、Quick and Easy Installation: Vertical or horizontal placement using, Aquarium heater automatic temperature control 78℉, no need to adjust temperature, easy to operate. 4、This fish tank heater should be 100% submerged into water. Power:25W / 50W optional. 5、Convenient and Safe: The aquarium heater has two suction cups for attachment to the fish tank. Both suiting for fresh or saltwater aquariums, provide a constant warm environment for your tropical fish to stay healthy. The aquarium heater is small and the temperature is adjustable. It is suitable for seawater and freshwater, 30-40 cm small fish tank. Features: Mini Heater: The fish tank heater is small, the length is 12.5 cm, the diameter is 1.8 cm. High Quality: The aquarium heater is made of high-quality quartz , double seal material, advanced design, ensures safe operation. Quick and Easy Installation: Vertical or horizontal placement using, Aquarium heater automatic temperature control 78℉, no need to adjust the temperature, easy to operate. This fish tank heater should be 100% submerged into water. Power: 25W / 50W optional. Convenient and Safe: The aquarium heater has two suction cups for attachment to the fish tank. Both suiting for fresh or saltwater aquariums, provide a constant warm environment for your tropical fish to stay healthy. Specifications: Item name: Aquarium heater Main material: Quartz Optional power: 25W/ 50W Voltage: 110V-120V(US); 220V-240V(EU) Size: Length: 12.5 cm; Diameter: 1.8 cm Suitable for: 30-40 cm small fish tank Note: * There could be some deviations due to manual measurement or slight color difference owing to photographing condition. Thank you for your understanding. Package Information: Package size: 15*8.5*5.5 cm Package Weight: 132g Packing List: 1* Aquarium heater 1* Aquarium heater