The sterilizing lamp can only be used in the filter tank, not directly in the fish tank, or the fish will be injured or died due to long-term ultraviolet radiation Please pay attention Use a timer(not included) if necessary, Use for no more than eight hours.DescriptionThis UV Submersible Light fish tank bar brings the light to the inside of your aquarium. The in-frame mounting allows you to see the light without seeing the fixture. The LED Strip Lights provide the ultimate opportunity to create a realistic underwater home-aquarium environment.Features- Material: Quartz glass.- Color: As shown.- Product demensions: 25 x 2 x 2cm- Item weight: 190g.- UV lamp with strong effect of sterilization, ultraviolet ray transmitting rate of more than 95%.- Quartz tube high-quality rubber parts with strong sucker to firm installed.- Safe and low voltage: LED lights is 20% brighter and is designed for reliable, long-term performance.- Easy to fix with strong suckers, firm and reliable.- Warm Tip: Dear buyer, Due to lighting effect,monitor's brightness,manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand Thank you