This product has a germicidal UVC function and is effective in keeping your fish tank clean and bright. It is very easy to use and very effective. High quality filament for high performance and power saving. Made of quartz glass tube, resistant to high light transmission UVC. Powerful suction cup for free position adjustment. Waterproof design, can be used completely submerged in water. Independent switch for safer and more ideal use. Suitable for controlling malignant bacteria in aquariums and fish tanks. Power: 5W / 7W / 9W / 11W / 13W (optional) Voltage: 220V; Body material: quartz glass Cable length: approx. 150 cm / 59 inches Caution: 1. The steriliser must be placed in the filter box and not directly into the fish tank. . 2. This product is intended for diving use. 3. If the light enters the water during use, turn off the power and stop using it immediately. 4. UV radiation can cause direct damage to human skin and eyes, please do not expose to use. Suggestions for use: Please choose the right lamp for the size of your aquarium and filter tank. Use 3-4 times a week for no more than 2 hours a day; please use according to actual conditions. Packing list: 1 * UV steriliser for aquarium lights 2 * Suction cups