Yes, batteries. There is one in the behind-the-neck box and one inside the right speaker. Apparently, the electronics are inside the left speaker, because the only other thing inside the neck box are the USB jack and the charging LED. Let me take a look.
Yep, that's where the brains are. I'm charging it now. Hopefully, it will last longer than ten minutes now.
Yep, that's where the brains are. I'm charging it now. Hopefully, it will last longer than ten minutes now.