With the G5 G Force Lighted Nock system, never again will you have to push, pull or turn your lighted nock. The new G-Force Lighted Nock is activated by the change in G-Force created by your shot. Once the arrow leaves the bow, the blue LED light is activated and shines up to six seconds before transitioning to a blinking mode. To deactivate the nock, tap the back of the nock 3 times. The electronics run on the same micro processor that is used in advanced electronics. They are sealed deep inside the nock and are 100% waterproof. Battery replacement is easy and the patent-pending battery retention system keeps the nock flashing for up to 40 hours or until switched off. G5 Outdoors is known for their outstanding quality and design of archery supplies and the G5 lighted nocks are no exception.