This is not a rechargeable device. It uses batteries to run it. You plug in the mp3 player with the adapter shown in the picture, and it becomes the speaker for your device.
I posted the back picture, it's where the on-off switch is, and the hole is for holding the cord when not in use. The bottom picture is where the batteries go.
Thank you for the extra pictures. I will not retract my bid, but my kids just gave me a brand new one as a belated Christmas present. So, for all other bidders, don't give up, my current high bid is 444 and I will not be bidding anymore. Merry Christmas.
I had a question by email as to whether or not it works with an ipod, I don't think it would fit, perhaps if you got an adapter it would. It does work with the computer really well, I tried that and the volume was great. In fact, rather nifty, I hadn't realized it would do that.