Description: Fish tank siphon pump is an perfect cleaning tool to clean gravel and change water. Cleaning fish tank will become very effortless. Fish tank vaccum cleaning uses 2 batteries (2 C/LR14), just press the power button then start working. Please don't use it continuously for more than 30min to preventing motor damaging. Three tubes of different lengths can be freely combined, the maximum length of the tubes combination is 82cm. Suitable for small, medium and large aquarium. You can install the aquarium gravel syphon acccording to icon easily. To start working please keep the current water level between the min and max water level on the handle, and then it can work in any water level. Remove the dirty things from the bottom of your aquarium effectively. Specification: Type: Aquarium Battery Cleaner Material: Plastic. Battery: 2 x C Batteries (Not Included) Shortest: 56cm/22.04 inch longest: 82 cm/32 inch Water Changing Tube Length: approx.75cm/29.5 inch Suitable Water Level: The Lowest Water Level (Single Sand Filter Head) is 11cm Extension tube: 40cm / 15.8 inch Extension tube: 15cm / 5.9 inch Package Includes: 1 Piece Aquarium Battery Cleaner 1 Piece Filter Mesh Bag 1 Piece Siphon