Profile: Lee Dan Communications, Inc. provides intercom and postal products. Our product line includes commercial sound, custom metal works, lobby panels, mailboxes, and video intercoms. Our surface flange and surface mounting loud speakers are connected to a high compression driver system that provides high efficiency, peak-free response, and superior sound penetrating range. The wide angle design of the rectangle type further improves the acoustic efficiency. Our Model AT-406 is equipped with 2 hand set communication systems. It is equipped with electronic call tone, front loading battery, and external signaling devices.