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Bill as Crash said they have a lithium bat. and light only after you shoot. The nock is pushed in and that turns the light on. They come three in a pack and replace your regular nocks. I have tried them and they work great your arrow looks like a laser light headed to its mark. I have shot them in the cellar at my indoor target and they are unreal. All you do if you do shoot one is pull the nock back out about an 1/8 inch and the light goes out so they can be used over and over.
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