Eyebots were originally designed by RobCo before the Great War to act as media transmitters. Several models exist, but generally, they consist of a spherical body roughly two feet in diameter, capable of hovering a few feet above the ground through an unseen method of propulsion. Though not as sturdy as other robots, eyebots' design is quite modular, allowing them to be equipped with a wider variety of tools, small weapons, radio transmitters and more.
The variant seen in Fallout 4 appears to be specifically designed for reconnaissance and surveillance, but are still often used to broadcast information and propaganda. Both the Commonwealth Minutemen and Brotherhood of Steel sometimes utilize eyebots for such reasons.
Eyebots are floating, spherical robots with various antennas, a large speaker on their front ends and a small, very weak laser weapon mounted underneath. Encountered throughout the wasteland, they are broadcasting radio stations, pre-War advertisement loops or just static.
Eyebots cannot be "activated" (spoken to or pickpocketed), but they can be killed or hacked via the Robotics Expertperk. They are one of the weakest enemies in the game and can generally be destroyed with a single hit from most weapons. Unlike the eyebots encountered in previous Fallout titles, eyebots in the Commonwealth do not explode upon death.
The basic eyebot model. It can be seen roaming Diamond City and random places in the Commonwealth. One particular eyebot has a loudspeaker advertising jobs at Cambridge Polymer Labs.
This eyebot also serves the Mechanist and uses a laser gun as a weapon to attack the Sole Survivor. Although it has pretty low health on lower difficulties, it may be hard to hit due to its erratic movement pattern.
With the Automatron add-on installed, the Sole Survivor can have access to their own eyebots, through the eyebot pod, which can find materials (such as adhesive) for their settlements. However, one cannot build their own eyebot with the robot workbench.
Even though many eyebot variants can be seen in the Automatron add-on, the eyebot cannot be customized in any way.
Unlike the other robots, eyebots have no modeled internals and their shell cannot be shot off.
Eyebots are not as frequently found in the Commonwealth as they are in the Capital Wasteland.
Due south of the southernmost cave, and due west from the Skylanes Flight 1665 wreckage, one will come across a lone eyebot patrolling a small section of ground in a triangular pattern. The eyebot is not hostile, does not broadcast any audible message and cannot be interacted with.
Behind the scenes
The eyebot resembles the Sputnik-era satellites, predominately the Sputnik 1, an artificial Earth satellite launched by the Soviet Union in 1957.
↑Fallout 4 Vault Dweller's Survival Guide : "Eyebots are designed for reconnaissance and surveillance, but they're often used to broadcast information and propaganda to remote areas. The Minutemen and Brotherhood of Steel sometimes utilize Eyebots for such reasons."