This product with UV sterilization function can keep the fish tank clean and bright. It’s very easy to use and with great effects. (See the end of the product information for an installation map.) Features: High quality filament for high performance and energy saving. Adopt explosion-proof quartz glass tube for high transmission of ultraviolet rays. Powerful suction cups to adjust the position freely. > Safe, waterproof construction for fully submersible applications. Independent power switch is ideal for safe use. Suitable for controlling malignant bacteria in aquariums and fish tanks. Specifications : Power: 5W / 7W / 9W / 11W / 13W (Optional) Plug Type: EU / US (Optional) < br/> Voltage: EU: AC220-240V; US: AC110-120V Body Material: Quartz Glass Cord Length: Approx. 150cm / 59in * Product Size (D * L): 5W / 7W: 20 * 177mm / 0.8 * 6.97 in 9W: 20 * 220mm / 0.8 * 8.66in 11W / 13W: 20 * 240mm / 0.8 * 9.45in Product Weight: 5W / 7W: 125g; 9W: 134g; 11W / 13W: 144g * Package Size (L * W