Brand New ISA449WH patio speaker for IM4406, IM4006, IMA4006 and IMA4406 master stations. Here are the specs from Nutone: • Talk from any station to all other remotes/stations • “Hands-free” answering at all remotes/stations • One button talk/listen: Push to speak, release to hear reply • Private mode prevents unwanted monitoring • Answer door from any remote/station • Control radio and CD player from speaker; on/off, select radio memory channels/CD tracks • Control music and intercom volume using built-in control • Surface mounts • Includes mounting frame