The RM-320F is a function key extension unit developed by TOA to increase the operational capabilities of compatible TOA Remote Microphones. Designed specifically for professional audio and voice communication systems, the RM-320F enables users to add up to twenty additional function keys, making it particularly suitable for facilities that require extended control options across multiple zones or equipment configurations. This extension unit is ideal for integration within public address, voice alarm, and paging systems in environments such as transportation hubs, educational institutions, commercial buildings, and industrial facilities. By offering flexible input assignment through external programming, the RM-320F allows operators to manage broadcasts, initiate pre-recorded messages, and execute command functions with precision. The product integrates directly with the host remote microphone via a straightforward connection method, maintaining system consistency without adding complexity to the operational workflow. The RM-320F plays a critical role in enhancing the scalability and adaptability of TOA’s remote microphone systems, allowing integrators and system administrators to meet complex communication requirements while upholding TOA’s standards for reliability, safety, and functional design. Its durable construction and compatibility with TOA’s VX-3000 series microphones make the RM-320F a dependable addition for long-term use in high-demand environments.