OPT is the newer laser hair removal technology that is more effective than IPL and SHR. We know that SHR is an improved version of IPL, but the old SHR technology is effective in the first 3-5 shots in one second. As the name implies, OPT (Optimal Pulse Technology) is effective with every shot, so fewer shots are required to achieve desired results. It is safer, faster and less painful than IPL and SHR.