This is a type of electric aquarium vacuum, except that Eheim realized that adding electrical wires to gallons of water may not have a good ending all the time. So what they did was design a battery-operated unit instead.
Buy hot selling aquarium cleaner vacuum battery at DHgate.
Have you ever vacuumed your tank and run out of water before you run out of crud? I could never seem to get my tank clean without removing most of the water. I looked at battery powered vacuums but the high prices and poor reviews made me reconsider.
I came up with this powered vacuum using old parts from past aquariums.
Penn Plax Super Battery Vac Aquarium Vacuum Cleaner - Pinterest
These battery powered gravel vacs are super cheap and as you would expect, they don't work very well... UNTIL you make a few modifications like i've done in this video. If you have bare bottom tanks in your fishroom and you're tired of looking at fish waste, give this modification a try, it's extremely satisfying!
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Penn Plax Super Battery Vac Aquarium Vacuum Cleaner