excaliber they have it where u can set it to the speed of your bow. I've got one on my stryker and I love it. I've got a buddy that has one on his crossbow and he loves it, my father in law has on on his parker buckbuster and he loves it. So far everybody that I can think of that has on loves it so it might just be the ticket for what your looking for they cost around a 100 dollars and up though. It's one of those things that u get what u pay for... JMO