Aquarium Battery Syphon Auto Fish Tank Vacuum Gravel Water Filter Maximum water depth: 52cm(20.47"). Flow rate 520 l/h. Material: High Quality ABS Plastic and Electronic Components. Power Requirement: 2 x Battery (C/LR14, not included). Package Included:1 x Battery Fish Tank Gravel Cleaner , with 1 piece LED Flashlight (Length: 8.3cm, Batteries not included), 1 piece 9.5x5cm fence for potted decor