The product is made of high quality materials. It has strong sterilization ability. The ultraviolet(UVC)can eliminate the virus and bacteria to provide a healthy environment for fish. It can be applied to fish tank, aquarium, pool, pond, etc. Features: High quality filament, strong effect of sterilization and energy saving. This UV lamp is made of premium quartz tube, high transmission of ultraviolet ray and good sealing property of lamp body. The UV light sterilizer can sterilize and disinfect with its ultraviolet light to remove bacteria, germs and algae of water and then provide healthy environment for your fish. Comes with strong suckers keep it firm and allows free adjustment of position. Power plug with on/off switch for convenient and safe operating. Suitable for fish tank, aquarium, ponds, swimming pool sterilization using. Specifications: Condition: 100% Brand New Material: Plastic Voltage: 220-240V Plug Type: EU Plug Model Power Light Tube Diameter Light Tube Length Power Cord Length UV-5 5W 19mm / 0.7inch 165mm / 6.5inch 2m / 78.7inch UV-7 7W 19mm / 0.7inch 185mm / 7.3inch 2m / 78.7inch UV-9 9W 19mm / 0.7inch 225mm / 8.9inch 2m / 78.7inch UV-11 11W 19mm / 0.7inch 245mm / 9.6inch 2m / 78.7inch UV-13 13W 19mm / 0.7inch 245mm / 9.6inch 2m / 78.7inch Package Weight: Approx. 250g~264g Package Included: 1 x Aquarium Sterilizer Light 2 x Suckers Note: The sterilizer lamp can only be used in the filter tank and can not be used directly in the fish tank, otherwise the fish will be injured or dead for the long time ultraviolet radiation. If necessary, please match the timer and arrange the reasonable use time.