Great new product in the UniversalGadgets Aquarium Range!The hard task of cleaning fish tanks and gravel is now a thing of the past， I know from experience when cleaning out the tank it is a long and boring process of gradually removing everything and cleaning it.This new product however means you can clean your tank without taking anything out! Left over food and fish feces that gather in the gravel is generally what is making the water filthy and become dangerous to fish as the PH levels change.Simply put 2x C batteries in (not included)， push the button once set up and place over the gravel for the pump function to clean off all the rubbish collected at the bottom of your tank.The tool is made for small to large tanks， with its extaendable reach.This pump does not only clean the gravel but it can also be used as a battery operated siphon pump， or you can connect the hose to the outlet and have a very easy life when draining the water.100% brand new and high qualityAdjustable height.Hose & Filter bag included.Maximum water depth 52cm.Flow rate 520 l/h.Material: High Quality ABS Plastic and Electronic Components.Power Requirement: 2 x Battery (C/LR14， not included).