Google is your friend. Gainswave is a drug to improve sexual performance.
My experience is if it's not prescribed by a doctor is probably not worth it. If you are having problems (not saying you are) it probably better tobsee your doctor and create a treatment plan.
Still searching for someone that has actually tried this. What is the costs? I am picturing them putting an oxygen type mask over your junk and blasting Led Zepplin music into your Johnson?