Homing beacon

The  is a weapon in Fallout 4.

Characteristics
This beacon is given to you by Zao after completing a quest for him. He gives you three beacons to be used wisely.

Once thrown, the beacon will blink and after a short delay a tactical nuke will hit the spot where the beacon landed. This does not work in tight spaces, deep quarries or inside separate cells.

The beacon can be 'pickpocketed' into the inventory of an enemy and still work, however only one beacon can be active while in the enemies inventory.

Locations
This unique grenade/beacon can be acquired from Zao on the Yangtze after doing a quest for him.