Interloop™ works with industry standard Two-Wire, Party-Line intercoms, connecting to the existing intercom system like any other belt pack. Utilizing Bluetooth Wireless Technology, a rear panel switch selects Headset or Phone connection. Headset mode allows you to connect to a Bluetooth enabled headset for wireless freedom. Phone mode allows you to connect to a wireless phone to let others join in, or connect to a notebook or laptop to provide remote voice access using VoIP applications such as Skype™. Powered by the intercom system, yet uses less current than a typical belt pack. Includes 9 VDC battery backup, holding the wireless connection while changing cables.