Lumbar Back Massager with Heat

I bought these as a gift for my grandma because she has a bad back. She broke her hip several years ago, and her posture had gotten worse. She used to be tall and skinny, but now her back is more of a hump. She often had pain in her lower back, so I thought this might help her. She says she loves it and it’s easy and comfortable to wear. She prefers wearing it than having to put on a back brace. But she still needs to wear a back brace.