The MARINA Multi-Vac is a powerful 3 in 1 aquarium gravel cleaner, algae remover and water siphon. Since the Multi-Vac is battery operated, it eliminates the possibility of electric shock. A simple push of a button and the Multi-Vac jumps into action. The side bag makes it easy to trap debris or simply attach a hose when a water change is needed. The Multi-Vac is extendable from 8\" to 16\" which makes it ideal for most aquariums. Features: Provides the convenience of a cordless cleaner/siphon Battery powered ... eliminates risk of electric shock Requires 2 \"C\" batteries (not included) Performs 3 functions (gravel cleaner, water siphon and algae cleaner Extendable - from 8\" - 16\" Vacuum bag collects all debris