Bright Lumenok light comes on when arrow is released, then stays on until you turn it off. Gives you a good look at your arrow flight, from release to impact. Simply remove your nock and install the Lumenok.
Here's How it works!
When the nock is fully seated against the electrically conductive end of the carbon or aluminum arrow shaft, the Lumenok lights up and is ready for action. Wiggling the nock in the shaft breaks electrical connection between the arrow shaft and the Lumenok, causing the light to go off.