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