UV sterilize lamp is made of high quality Quartz tube, rubber parts and strong sunction cups. The UV light sterilizer can clean up the water in fish tank, remove bacteria, germs and algae, provide healthy environment for fishes. We have 2 power of UV light sterilizer for you to choose, Voltage: 110V, US Plug Wide Applications: suitable for fish tank, aquarium, pool, ponds, drinking water industry, biopharmaceutical industry, etc. NOTE: It is submersible, please install and place it in the filter groove when you use it. DO NOT expose the fish directly under the UV light for long time. You only need to turn it on for 2-3 hours every day, and then the bacteria will be killed.