Feature: 1. REMOVABLE SUCTION CUP: This UV germicidal aquarium lamp is made of quartz glass, please don't shake it, it is easy to cause short circuit. The detachable suction cup can firmly fix the aquarium light and is not easy to fall. 2. WIDE RANGE OF APPLICATIONS: This ultraviolet aquarium lamp has a wide range of applications, such as fish tanks, rockery fountains, and aquaculture. It is suitable for various environments, and is widely used for disinfection of indoor homes, office places and other places. 3. KEEP THE WATER QUALITY CLEAR: This fish tank germicidal lamp only needs to be turned on for two hours a day to inhibit harmful bacteria in the water, prevent bacteria reproduction and algae growth, reduce the prevalence of fish and keep the water quality clear. 4. DESTROYING THE DNA OF MICROORGANISMS: This aquarium cleaning lamp is irradiated by ultraviolet rays, destroying the DNA of microorganisms and causing them to lose their ability to reproduce and die. Most of the bacteria and algae in the water are killed, thereby restoring healthy water bodies. 5. WATERPROOF DESIGN: Waterproof design, thick protective cover, the tail is made of insulating material, and multistage sealing circle, which can be used for diving. The three core materials, tungsten filament, filament connecting column, inert electronic powder, high quality and durable. Specification: Item Type: Fish Tank Light Material: Quartz Glass Suitable for Fish Tank: Approx. 150cm / 59in Lamp Length: Approx. 23.7cm / 9in. Package List: 1 x Germicidal Lamp2 x Suction Cup Note: 1. Do not irradiate people and animals directly2. If the power supply is found to be damaged, it cannot be used3. The germicidal lamp can only be used in the filter tank, not directly in the fish tank4. Please allow 0.1‑0.5cm / 0.04‑0.2in error due to manual measurement. Thanks for your understanding.