I don't know, Wiz.

But, I am more than willing to take my chances and keep using my electric throw blanket for my legs - it helps soooo much with the pain this time of year. I have also been known to use it even in the summer

I will not use an electric blanket on my bed anymore. Did it for a long time but, started having sensations that would wake me up, as if I was on fire and burning