13W UV Light Sterilization Lamp Submersible Ultraviolet Sterilizer Water Disinfection for Aquarium Fish Tank Pond AC110-120V Powerful suction cups for adjusting position freely. Suitable for controlling malignant in aquarium and fish . water-proof design for totally submersible use. filament for high performance and energy-saving. Independent switch is great for safer use. Adopt explosion proof tube for high transmission of ultraviolet ray. Usage Suggestion: Please choose suitable lamp according to size of your fish and filter-. 3-4 times for a week, do not use it exceeds 2 hours per day; please according to actual situation. Specifications: Cable Length: Approx. 150cm / 59in 11W/13W: 20 * 240mm / 0.8 * 9.45in 5W/7W: 23 * 7.5 * 4cm / 9.1 * 2.95 * 1.57in *Product Size(D * L): 9W: 20 * 220mm / 0.8 * 8.66in Wattage: 5W / 7W / 9W / 11W / 13W 5W/7W: 20 * 177mm / 0.8 * 6.97in Package Weight: 5W/7W: 168g; 9W: 182g; 11W/13W: 190g *Package Size(L * W * H) Body Material: Voltage: : AC110-120V 9W: 26 * 7.5 * 4cm / 10.2 * 2.95 * 1.57in 11W/13W: 28 * 7.5 * 4cm / 11 * 2.95 * 1.57in Product Weight: 5W/7W: 125g; 9W: 134g; 11W/13W: 144g (Optional) This product, with UV sterilization function, can keep fish and bright effectively. It's very simple for use and with great effects. Package List: 2 * Suction Cups 1 * Aquarium UV Sterilizer Lamp Notice: 1. sterilizer should be placed in filter , can't put it in fish directly. 2. product is for submersible use. 3. In use process, please cut off supply and stop using immediately if lamp enters water. 4. ultraviolet radiation will cause direct harm to human skin and eyes, please don't expose to use. High quality filament for high performance and energy-saving. Adopt explosion proof quartz tube for high transmission of ultraviolet ray. Independent power switch is great for safer use. High quality filament for high performance and energy-saving. Adopt explosion proof quartz tube for high transmission of ultraviolet ray.