Aquarium UV Sterilizer Light Submersible Water Clean Lamp for Pond Fish Tank Product description:- Suppress harmful bacteria in the water.- Prevent growth and algae reproduction.- Reduce the prevalence of fish.- Keep the water clear.- A separate power switch is ideal for safer use.- By ultraviolet radiation, the microbial DNA is destroyed, its reproductive capacity is lost, and most of the bacteria and algae in the water are killed, thereby restoring healthy moisture.- Made of high quality materials for durability.- The tail is made of insulating material, which is waterproof and safer. Multi-stage seals are available for diving.- The scope of application is not only fish tanks, but also rockery fountains, fish and aquaculture. PS: 1. This product can emit effective ultraviolet rays. Ultraviolet rays have a certain amount of damage to the human body. Please do not observe with the eye. Direct exposure can hurt people's eyes and skin. Direct exposure to living things is prohibited. 2. It is recommended to turn on the lights for about 2 hours each time. It is forbidden to turn on the lights continuously for more than 6 hours. 3. The germicidal lamp can only be used for the filter tank. It can not be used directly in the fish tank, otherwise the fish will be injured or killed due to long-term ultraviolet radiationProduct specifications:- Power: 5W / 7W / 9W (optional)- Plug type: US regulations - Voltage: 220V- Body material: quartz glass - Lamp length: 18 cm (5 W / 7 W), 22 cm (9 W),- Cable length: approx. 143 cm - Suitable for fish tank size: 60 cm (5W), 80 cm (7W), 100 cm (9W), Package Included: - 1 x aquarium diving UV lightnotes:- Due to differences between the different displays, the picture may not reflect the actual color of the product.- If there is a problem with the product, please leave a message before giving the error feedback. - Allow 1-3mm error due to manual measurement.