Those products don't set off security alarms. You can literally stand there playing catch across a security door with a can of Red Bull, and it won't set off the alarm, unless the store has put a security tag on it.
(Don't actually do this. While you won't set off the alarm, retail establishments generally don't appreciate these kinds of shenanigans.)
DblDtchRddr t1_j28dgft wrote
Reply to comment by Pleasant_Broccoli451 in Eli5: How does a product know it's paid for? by Pleasant_Broccoli451
Those products don't set off security alarms. You can literally stand there playing catch across a security door with a can of Red Bull, and it won't set off the alarm, unless the store has put a security tag on it.
(Don't actually do this. While you won't set off the alarm, retail establishments generally don't appreciate these kinds of shenanigans.)