I have several different injuries due to a life of sports and hard physical labor. I have tried red light therapy in the past and it works, but to have my own personal red light therapy device that I can use anywhere on my body is absolutely fantastic. The fact that this belt goes to 1000 Hz is amazing! I will be using the controlled setting to go to 10 Hz. 40 Hz, all the way to a 1000!!! It is absolutely fantastic! It is easy to use and has a LIFETIME WARRANTY. Incredible!