The Evolution Plus is a resistance activated release and is the perfect release for teaching proper shot execution. The release will fire when you increase the resistance. It is adjustable from 12-30 pounds depending on which spring is installed. To fire the release, hold the safety down as you pull back. Then once you get into your valley and anchor in, let you thumb off the safety and begin pulling and building pressure on the back wall of the cam until the release fires. Evolve into the best shooter you can be with the new Evolution Plus.