Features: 1. High quality filament for high performance and energy saving. 2. Adopt explosion-proof quartz glass tube for high transmittance of ultraviolet ray. 3. Grasp powerful to freely adjust the position. 4. Waterproof safety design for fully submersible use. 5. Independent power switch is ideal for safer use. 6. Suitable for controlling malignant bacteria in aquarium and fish tank. Specifications: Watt: 5W/7W/9W/11W/13W (optional) Plug Type: EU/US (optional) Voltage: EU: AC220-240V; US: AC110-120V BODE MATERIAL: Quartz Glass Cable Length: Approx. 150cm / 59inch size(d*l): 5W/7W: 20mm x 177mm/0.8in x 6.97in 9W: 20mm x 220mm / 0.8 inch x 8.66 inch 11W/13W: 20mm x 240mm/0.8 inch x 9.45 inch Quantity: 1pc NOTICE: 1. The sterilizer should be placed in a filter tank, can’t put it into the fish tank directly. 2. The product is for submersible use. 3. In the process of using, please turn off the power and stop using immediately if the lamp enters water. 4. Ultraviolet radiation will