Features: 1.Multifunctional: Electric aquarium water changer removes gravel, removes dirt from the bottom of the tank and changes the water. 2.Safe: This aquarium vacuum water changer is safe, energy efficient, and powered by an AC adapter or 2 C batteries (not included). 3.Water Changer: Fish tank vacuum cleaner can be used as a water changer and shut off after siphoning. Easily drains fish tank dirt. 4.Retractable Design: Aquarium gravel cleaner with retractable design, easy to adjust, suitable for different size of fish tank. Easy to install and operate. 5.Note: Clean the filter bag in time after cleaning the gravel (it is consumable, if it can't filter properly due to damage, please replace it with a new one). Specification: Item Type: Aquarium Water Changer_x000D_ Material: ABS_x000D_ Plug: EU Plug, Rated Voltage: 100-240V_x000D_ Battery Type: 2 x Dry Cell_x000D_ Battery Type: C Type Batteries (Shipped without Batteries) PackageList: 1 x One Piece Motor 3 x Telescopic Conduit 1 x Mesh Bag Interface 1 x Filter Bag 1 x Siphon Tube 1 x Sand Washing Cup 1 x Plug 1 x Instruction Manual 1 x Moss Removal Brush Note 1. Please use our professional adapter for external power supply._x000D_ 2. Do not work continuously for more than 30 minutes to avoid burnout._x000D_ 3. This product is designed using the siphon principle, and cannot pump water from low water level to high water level._x000D_ 4. When draining, the highest point of the drain pipe must not be higher than the starting water level line, otherwise the product cannot pump water normally._x000D_ 5. Please allow for some errors due to manual measurement.