Features:_x000D_1. High quality filament for high performance and energy-saving._x000D_2. Adopt explosion proof quartz glass tube for high transmission of ultraviolet ray._x000D_3. Powerful suction cups for adjusting position freely._x000D_4. Safe water-proof design for totally submersible use._x000D_5. Independent power switch is great for safer use._x000D_6. Suitable for controlling malignant bacteria in aquarium and fish tank._x000D_Specifications:_x000D_Wattage: 5W7W9W11W13WOptional_x000D_Plug Type: EUUSOptional_x000D_Voltage:EU: AC220-240V; US: AC110-120V_x000D_Body Material: Quartz Glass_x000D_Cable Length: Approx. 150cm59inch_x000D_SizeD*L:_x000D_5W7W: 20mm x 177mm0.8inch x 6.97inch_x000D_9W: 20mm x 220mm0.8inch x 8.66inch_x000D_11W13W: 20mm x 240mm0.8inch x 9.45inch_x000D_Quantity:1 PC_x000D_Notice:_x000D_1. The sterilizer should be placed in filter tank, can't put it in the fish tank directly._x000D_2. The product is for submersible use._x000D_3. In use process, please cut off the power supply and stop using immediately if the lamp enters water._x000D_4. The ultraviolet radiation will cause direct harm to human skin and eyes, please don't expose to use._x000D_Usage Suggestion:_x000D_1. Please choose the suitable lamp according to the size of your fish tank and filter-tank. _x000D_2. 3-4 times for a week, do not use it exceeds 2 hours per day; please according to the actual situation.Package List:_x000D_1 x Aquarium UV Sterilizer Lamp_x000D_2 x Suction Cups_x000D_