The TS-692L is a Delegate unit of the TOA conference system, TS-690 Series of which compact and lightweight design makes it easy to install and store. Placing the speech button in ON position permits speech and disable the speaker to prevent feedback. If the speech button is placed in the OFF position, the microphone cannot be used but the speaker is turned on, allowing voices from other conference units to be monitored. And the TS-692L Delegate Unit comes with a long microphone as a standard accessory.