Additional headset for Pro-Link intercom system. Allows an additional fan to link to, and talk to others with Pro-Link Plus headsets. Users can listen to their own scanner or share one. Each unit has it's own volume control and push-to-talk button. Each headset operates on a 9-volt battery, included. System includes 1 headset, 1 link cable and 1 scanner cord. Requires similar units to use talk feature. Will not work with two-way radios. These are used to communicate with someone standing beside you.