The BlueSet series of intercom headset adaptors use Bluetooth® Wireless Technology to add wireless freedom to your intercom system. BlueSet replaces the wired headset on your intercom belt pack, allowing you to connect to your Bluetooth enabled headset or cell phone. A 3.5 mm stereo headset jack contains a mic level output signal suitable for recording, with the beltpack headphone signal on the left channel, and the Bluetooth return signal on the right. A switch selects between connection to a 3rd party Bluetooth headset or a cell phone. Headset Connect: Pair BlueSet to your Bluetooth headset. Leave your belt pack on the desk as you walk around the room. Some Bluetooth headsets allow you to switch between two phones, or in this case, switch between your intercom and your cell phone. Phone Connect: Pair BlueSet to your cell phone to extend your system around the world. The belt pack Mic/Talk button controls audio from the cell phone into the intercom system.