Upgrade your existing intercom system master unit. This mounting frame is used to mount the Master  unit with CD Player, in your existing intercom location - With out having to patch the wall.

Most older intercom stations are larger the the new units. With out the retro-fit mouting frame, you are required to patch the wall re-paint.... Now you simply replace the old intercom with this frame, insert the NM100 or NM200 intercom system, and you are ready to go.