It's a glow stick, so there is no turning it off. I used these on my bear hunting last year, and the camera picked them up better than my eye did. I would just have a nock and FOB in my hand waiting for animal. When one showed, I would snap the glow stick and put the nock on. It's pretty simple and, best of all, legal in WA and ID. The drill I used was a bit big for the WalMart glow sticks, so I used a single layer of scotch tape to make a friction fit. One tip with these: color on the ones you've shot with a permanent marker so you can determine new from used in your archery tackle box.