Servo

A servo was a multi-function device employed by Gary Seven that resembled a pen. 

The servo had several functions, and served as:
 * A communicator, which allowed Gary Seven to communicate with the Beta 5 computer and initiate transport.
 * A personal defense mechanism. It had both a stun setting, which made its target go into a hypnotic state open for suggestion, and a kill setting.
 * An electronic manipulation device, which Gary Seven used to deactivate the force field keeping him in the brig of the USS Enterprise (NCC-1701).
 * A mechanical manipulation device, with the ability to serve simple purposes such as unscrewing screws, and locking and unlocking doors.

Servo Servo