The TS-770 is a Central unit for TOA Conference system, of which compact design makes it easy to install and store. Use of its line connection terminals permits connections to the conference units of TS-771, TS-772, and TS-775, making up a conference system. Up to 3 Central units can be connected.

The TS-772 is a Delegate unit for TOA Conference system, of which compact and lightweight design makes it easy to install and store. Placing the speech button in the ON position permits speech and disables 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 the voices from other conference units to be monitored. Two types of dedicated microphones are made available for the TS-772 as optional products: the TS-773 standard type and the TS-774 long type.