Applicator holds a stack of plastic bands that allow for quick and easy application.  Remove plunger spring, slide strip of rings into chute leaving strip attached.  Replace plunger spring and then break off strip.  Push forward with your thumb until ring is exposed, then push thumb in to spread band.  Apply around leg and release pressure on thumb and tilt applicator down.  When thumb is fully released another leg ring will automatically be fed into the mechanism.