I have a Heating Pad, Queen size. Dial does not light or heat.
I have a plush 2 Dial Queen Heated Blanket. Dials light up but do not heat the blanket.
I have a Twin heated Blanket, Dial does light up but you have to mess with the pad, then it doesn't want to shut off. No big deal because it doesn't heat up anyways.
I also had a cordless (battery operated Dial) Queen Blanket, the cold got to the batteries and I was changing them every week. It's gone.

I have a throw heated blanket, I bought last year...Surprisingly, it's still working.