Louroe Audio Monitoring TLM-CS 4 inch speaker and electret condenser microphone mounted to a beige metal 7 5/8 inch grill. As part of a Louroe audio monitoring system, it provides hands-free two-way communication between the remote area and the Louroe audio base station or other audio receiving devices. TLM-CS is for SURFACE mounting to a ceiling. For FLUSH mounting, request Model TLM-CF