This is an active speaker designed for easy use in small events. It can be powered by a 9VAC adapter or 8 AA batteries, and the original adapter is included. It has only been used indoors and infrequently, so it is in beautiful condition with no dirt or scratches. The output is 3.6W x 2, but the two 70mm speakers produce a surprisingly powerful sound. Please refer to the manufacturer's website below for more details. https://www.audio-technica.co.jp/product/AT-SPB50?srsltid=AfmBOoo0znsY9Gmgu3oEA9Ns5x6OEeaWsWduV4Oz74B1pJmT1H69s3sa I have also listed it on an auction site, and if there are any bids, I will cancel this listing.