I am testing the Fire Nock S3 starter package right now. I got them back in the first week of October and they have worked great. They are a little pricey to start out about 60 Bucks, but you can replace the batteries in them and they are extremely easy to use. The batteries are about 10 to 15 bucks for 3 depending on where you pick them up. They activate when you shot and to turn them off you just hold them above a solid surface and drop them on the nock and it turns them off. I have the orange/red and they are really bright and easy to pick up after shooting. I would recommend them. Anyone have any input on any other lighted nocks?