The Germicidal UVC Light can be submerged in water for use in filters, aquariums, ponds, or anywhere clean water is needed that is free of algae and bacteria.This product has UVC germicidal properties that are effective in keeping your aquarium clean and shiny and free of algae and microorganisms.It is very easy to use and very effective.UVC radiation inactivates microorganisms quickly and effectively. When bacteria, viruses and protozoa are exposed to UVC light, they are unable to reproduce and become infected. UVC has been shown to be effective against pathogenic microorganisms such as those that cause cholera, polio, typhoid, hepatitis and other bacterial, viral and parasitic diseases.Do not expose your fish directly to the UV light emitted by this lamp, place them indirectly in a jar, filter, or in a tank with your fish, but in an opaque PVC or aluminum tube with a stream of water.Features:- High quality filament with high performance and energy efficiency.- Heat resistant quartz glass tube with high UV transmittance.- 2 strong suction cups for free position adjustment.- Safe waterproof gasket for complete immersion in water.- It has an independent power switch, perfect for safer use.- Great for controlling harmful bacteria in aquariums, ponds and fish tanks.Specification:- Power: 11W- Plug Type: USA- Voltage: AC110VMain Material: Quartz CrystalCable length: about 100cmWeight: 190gPackage weight: 230g* The sterilizer is best placed in a filter tank and should not be placed directly in a fish tank.*This product is suitable for use when diving.*Turn on while in the water.*Ultraviolet rays can cause direct damage to human skin and eyes, please do not use it exposed to sunlight.Suggestions for use: Use the light near the fish tank or filtration system or circulation pump. For small aquariums, place opaque glass or polycarbonate between the fish and the UV light to prevent them from being exposed to UV light. Direct Fishing*Can be turned off when the water is clean and free of algae and bacteria.Packing List:* 1 x Aquarium UV Sterilization Lamp* 2 x suction cups* 1 x Eliminator with built-in switch