This is an active speaker designed for easy use in small events. The earphone jack cord was purchased separately, so consider it a bonus. It can be powered by a 9VAC adapter or 8 AA batteries, and the original adapter is included. It has been used infrequently, only indoors, and is in good condition. 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 details. https://www.audio-technica.co.jp/product/AT-SPB50?srsltid=AfmBOoo0znsY9Gmgu3oEA9Ns5x6OEeaWsWduV4Oz74B1pJmT1H69s3sa