Louroe Audio Monitoring TLI-CS 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. TLI-CS is designed for surface mounting to a ceiling. Grill and mounting ring are included. For flush mounting to ceiling, request model TLI-CF.