Louroe Audio Monitoring TLI-CF is a speaker/microphone consisting of an 8 inch speaker and electret condenser microphone. Microphone produces line level output and an omni-directional audio pattern. Speaker is 8 ohms with a 70V transformer. As part of a Louroe audio monitoring system, the TLI provides two-way communication between the remote area and the Louroe audio base station.The TLI-CF is for FLUSH mounting to a ceiling. For SURFACE mounting request Model TLI-CS