AQUATOP's Magnetic Aquarium Cleaner with LED features an easy grip, ergonomic design combined with a powerful magnet to remove algae build up from your aquarium surface. The unique LED lighting feature illuminates the cleaning surface of your aquarium so that you�ll never miss a spot, and the night time viewing mode penetrates deep into your aquarium to view any nocturnal activity when your main aquarium lights are turned off. Safe for fresh or saltwater.