TOA RM-300X is a remote microphone designed for the Integrated Voice Evacuation System. It features 13 function switches for individual zone or zone group selection, a covered switch with corresponding indicators, and an optional RM-210F Remote microphone extension for expanding switches and indications. With its unidirectional electret condenser microphone with AGC, built-in chime, and adjustable microphone sensitivity, monitor speaker volume, and chime, the RM-300X provides clear and effective communication in various applications.