The aquarium fish tank lamp have high plastic material shell,effectively prevent electric shock. Effectively reduce the heat generation problem of high luminosity LED lamps and prevent from rust. Easy to use, just put it on the top of fish tank and plug into the power. Ideal for freshwater and seawater. With extendable bracket to adjust the length to fit your fish tank,fits tank 28cm--48cm in length This item is non water-proof, so don't put it into the water.