Distress pulser

The distress pulser is a junk/quest item in Fallout 4.

Characteristics
Distress pulsers send out distress signals to nearby areas. They are a specialized piece of equipment with a long-lasting battery and powerful enough to cut through heavy interference; useful if someone wants to, say, mark a location for recovery in a heavily irradiated area.

It can be broken down into two aluminum, one circuitry and one nuclear material.

Locations

 * One can be found in the National Guard Training Yard in the room where Knight Tara Astlin made her final stand.
 * One is received from Scribe Haylen at Waypoint Echo during Liberty Reprimed, used to mark Sentinel site Prescott for recovery.