INSTEN Aquarium Fish Tank Vacuum Gravel Cleaner w Water Siphon Hose This battery-powered cleaner will clean your gravel and catch dirt without doing a water change It sucks the dirt with water through a filter bag, the dirt will be kept in the filter bag and water will return to the tank It can also be used to siphon the water out for a water change. Clean your gravel, siphon the dirt out without requiring a water change Adjustable height by two interchangeable pipes of different length, suitable for both shallow and deep aquarium Battery powered - safe for you and your fish. Height Adjustable from 55cm to 80cm. Recommended for aquariums with 26cm-62cm depth. Power by 2 x CLR-14 Battery (not included). User manual and filter bag included. Accessory ONLY; batteries not included.