Various Cleaning Modes: Multifunctional vacuum aquarium cleaning tool with powerful siphon pump for siphoning water changes, removing algae and cleaning gravel. Freely Adjust Different Lengths: Comes with two sizes of telescopic suction hoses, works for both large and small aquariums. Gravel vacuum installed, please keep the water level between MAX (80cm) and MIN (11cm), then start the switch. Aquarium Cleaning Function: Electric aquarium siphon cleaner for cleaning gravel, washing sand, effectively siphon fish feces and other dirt without requiring water changes. Come with a mesh bag of gravel and sand filter, fully repeated for durable use. Free your hands: Battery box on the top, electric operation with only 2 type C alkaline batteries (package not included). Before using the 2nd two batteries, in the battery, stay for 3-5 seconds, then use. Please do not use it continuously for more than 30min to 1 hour. Installation is simple: all components can be disassembled and placed, saving space. The interface adopts a threaded design which takes little time to assemble and can be used. Precautions/How to use: When the machine is turned on, the water level must reach the water level line marked by the main unit to work, otherwise the water will not be pumped out. During use, the sand washer can be lifted, but the water inlet of the sand washer should not leave the water surface, otherwise air will enter and water absorption will be interrupted . The machine idle time away from water should not exceed 1 minute. Features: -Easy to install aquarium sand washing water changer. - With this tool you can remove dirt from the bottom of the aquarium. - Effectively cleans bottom sand, siphons fish feces and other dirt without changing the water. - Press the on/off button on the top and the aquarium water will be automatically pumped through the hose to change the water. Product color: as in the photo Quantity delivered: 1 piece becomeveryrich