Hello, nice to meet you! (^o^) This is a compact ozone generator. It can be powered by a USB cable. It can also be powered by batteries, so you can use it in various ways. You can use it in places without outlets, such as shoe boxes, entrances, and toilets, so it's versatile. I purchased it as a new item, but perhaps because it's a foreign product, there are fine scratches on the back of the main unit, so I've listed it as "Like New". Areahome USB powered, battery powered (AA) 3mg/h, supports 1-25 tatami mats, low concentration ozone deodorizer, air purifier, small, for tobacco, entrance, toilet, pets, tobacco, for home, for car, powerful deodorization, deodorizer, quiet, maintenance-free #Deodorizer #Deodorization #Smell