I used my red light belt daily until it quit working. I did not register it so I knew I was out of luck on getting it replaced. I got it for Christmas and mid March something happened and it no longer worked. I had to purchase another one because I can’t be without it.
I’ve barely used it so far. No negative side effects yet. Make sure you get the power pack with this or it has to be plugged in for the entirety of the session.