How Does a Retractable Cord Work?

A retractable cord works by providing a small storage space for excess cord. The cord is on a set of rotatable wheels which contain space for the entire length of the cord. When the cord is extended outside of the device and reaches its maximum length, the user will feel tension on the cord and will not be able to move the device further without moving the device closer to the work area. The entire process is similar to the winding of a fishing wheel.