The TS-681L-AS is a Chairman unit for TOA Conference system, of which compact and lightweight design makes it easy to install and store. Placing the talk key in the ON position allows a chairman to speak and disables the speaker to prevent feedback. If the talk key is placed in the OFF position, the microphone cannot be used but the speaker is turned on, allowing the voices from other conference units to be monitored. By pressing the priority key, the chairman unit can take precedence over any delegate units. The TS-681L-AS is a chairman unit come with a long microphone as standard accessory.