It's so cool to see this on HN. I think this is one of the B&W Tek units that came from the NuSkin device which was err... of debatable scientific merit. It appeared on Dr Oz at one point:
Loads of these appeared on eBay as well as the complete Nu Skin units with identifying logos removed they used to go for about $15 which was a bargain. I think I picked up 5 or 6. Wrote up my note here: