Specifications Voltage 220VMaterial Quartz GlassPower 7 9 11WUV Transmission 90 Length 7W 18 5cm9W 22cm11W 24 5cmWeight 7W 182g9W 189g11W 189gDiameter 1 9cmPower Adapter EU Plug Features UV sterilizer helps neutralize harmful micro organisms and free floating algae ultraviolet ray transmitting rate of more than 90 Offer better water condition Install in vertical or horizontal position right in your aquarium or sump Can be used in fish tank swimming pool pond industry water processing cosmetics industry and so on Superior Explosion proof Quartz Glass Features excellent light transmittance and ultra durable lifespan Powerful Suction Cups For adjusting position freely Warning 1 Use the UV lamp 10 60 min a day should not be too long or a whole day long irradiation Use 3 4 times a week 2 Sterilization lamp can only be placed in the filter tank can not be used directly in the fish tank or the fish will be injured or killed because of a long time exposure to ultraviolet radiation Package Included 1 x Aquarium UV Sterilizer LampNumber 3 7WNumber 2 9WNumber 1 11W