The battery life on these lighted nocks are pretty awesome. These nocks are a great tool to use in order to find your arrow after a shot. It gives you a way of figuring out shot placement by the blood on the arrow as well as a way of tracking your shot on camera when you go into playback to check shot placement. Great nocks.
DONT BUY! Get lumenok instead. These go off just by putting them on your string. Sitting in my stand now after 30 minutes of trying all 3 and lighting the woods up. Now I have to try and figure out how to nock a strobing arrow while a deer is approaching and somehow not get busted! For $30 come on!