Drone Control Device

 is an item which is added to Fallout 3 in the Mothership Zeta add-on.

It can be looted from an alien in Mothership Zeta's Robot Assembly.

Uses
After the player obtains the Drone Control Device, they may activate any contained drones they come across on the Mothership and have a maximum of one drone follower at a time: a Support Drone or a Guardian Drone.

There is an exploit to this. Check the Discussion page.