I purchased the AR AW-822 so I could have music on my patio in the condo unit where I live. The speaker has a good tone but NEVER milsplace your power adapter. It is impossible to find a replacement and runniing it as much as I do on batteries get terribly expensive. I contacted the company, radio shack, electrical supply houses, everyone I could think of for a replacement. NO LUCK ANYWHERE! The adapter if you have not looked is an 18 volt dc. I even did a search on e bay. I am ready to purchase a different wireless speaker.