Model TLM-W is a two-way speaker/microphone with an electret condenser microphone and 2.5" speaker, all within one housing. As part of a Louroe Audio System, it provides 2-way communication between the remote area and the Louroe base station. Included with the TLM-W is a plastic back box for surface mounting to a wall. For flush mounting, a standard 3 gang electrical box is required (not included).