Well the lights cycle back and forth (with 1 of 3 chosen firing patterns), but only flash each LED for a
nano-second, so I think the battery in each will last pretty long. Also, I'll be turning them off as each player reloads a marked unit, and as we remove the markers off-board readying them to be used to mark another unit that's fired and needs to be marked for reloading.
I have smoke markers to do this already, but wanting to 'WOW' the guys with their Christmas gift early this year (we'll be playing a game today).