Nicrew Automatic Gravel Electric Aquarium Gravel Cleaner Water Filter Washer Siphon Vacuum Water Pump for Fish Tank Aquarium Removes detritus without taking out water Telescopically adjustable height for large and small aquariums Provides up to 2.5 hours maximum continuous runtime Ideal for complete aquarium cleaning or quick spot maintenanc Built-in 4400mAh lithium-ion rechargeable battery allows you to recharge the cleaner from power adapter (Not included) Product description Automatic Aquarium Gravel Cleaner This gravel cleaner allows you to vacuum all debris into a super-fine mesh cartridge that functions to trap even the smallest particulates and debris with a click of button. Cleaning your Aquarium Gravel Just put the it under the water and it will gently suck the water along with the debris. It then passes through a fine mesh that traps the debris, while the water is returned to the tank. Notes: For use in aquariums of all shapes and sizes with a minimum depth of 12?. Not recommended for fine sand or fine gravel. Please keep this package insert for future use. FREE SHIPPING IS INCLUDED!