This is a simple connector that does double duty. It eliminates one of KAP's most frustrating phenomena: the unwillingness of a 360-modified pan servo to stand still when you release the joystick.
It is installed between a modified servo and the receiver, and calibrated at the time of installation, will ensure that your servo will stop in its tracks when you release the joystick.
This set comes with a calibrated modified servo. A gearset is not included but sold separately.