I purchased this product and specifically wanted to use it with an AC power source. As you can see from the technical specifications, it can use the optional AC-E60A AC Adapter. (The same note is provided on the Sony web site.) That is not true. I spent a long time today with Sony support and the same answer from everyone was that, in fact, this speaker is not compatible with an AC adapter. If you want to use batteries, fine (although it did sound "tinny"), but if you want to use an AC power source, look elsewhere.