Thought I'd put this in general discussions so every one might see it. I found a small wireless speaker on ebay. It is called the innovage. its 4-1/4 in. wide x 5 in. long x 1-1/4 in. thick. I bought one and it works very well. It's only got about a 20 foot range, but should be useful if your running your bot around the house. Weighs in at 6-7/8 ounces. Will prob only fit in bigger bots. Thought I'd share with everyone. I also found them on Amazon.