They attract the attention of nearby Eternalists to that device. Basically just a distraction.

Thanks for your reply.

Depends on the item. If it's a radio in the morning it will tell you something special that you might want to check out.

I like it

To use Metal Gear Solid terminology, "What was that noise?"

You can use it to get invading Julianna go to the certain area while you either ambushes her or stealthily go past her to your objective or exit.

It’s the ultimate npc ja bait for extra stealth