This is a USB-powered mini air pump. It can be used for aeration in aquariums, oxygen supply for fishing bait, and more. I used it once to check its operation, but it has been stored unused since then. It provides a large amount of air and can be used for aquariums up to 60cm in size. [Product Condition] Like new [Power Supply] USB [Uses] Aquariums, fishing bait, aquariums, goldfish, tropical fish [Size] 8.5 x 3cm (cord length 90cm) Thank you.