I have been using the Infratonic 9 since October 2014 for various ailments, i.e. muscle aches, better quality of sleep, relaxation sessions, etc., and have been very satisfied with the performance of the device. I was finally pain-free and grateful for the I-9 which helped me recover quickly and safely. I recommend this device to anyone seeking pain-inflammation-stress-anxiety relief in a very effective way without dangerous side effects.