Aquarium Battery Syphon Auto Fish Tank Vacuum Gravel Water Filter Feature: Easy to install and use. Adjustable height. Remove the dirty things from the bottom of your aquarium effectively. Supported two suction pipe sizes, suitable for both small and large aquariums. Also be used as a water siphon for water changes, or to empty your aquarium when you connect a hose to outlet. Hose & Filter bag included. Specification: When you clean the sand in the bottom, equipped the strainer in water inlet, Assembled 2 batteries, after energization, put the water inlet in the bottom to stir sand, so that the dirt can be adsorb to the strainer ; When change the water, you just need to equipped the water outlet in fish tank gravel cleaner. When equipped the fish tank gravel cleaner, you must immerse the handpiece and water outlet in the water at same time, then turn on the switch, you can advance the fish tank gravel cleaner, while the water oulet can extract the water, remove the handpiece and water outlet above the water surface. Product Attributes: 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 Note: 1.Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand. Make sure you don't mind before you bid. 2. Please allow 1-5mm differences due to manual measurement.