Timeguard-DCA1-Single-Channel-Audio-Door-Phone-&-Intercom-Timeguard-DCA1-P-The-Timeguard-DCA1-Single-Channel-Audio-Door-Phone-&-Intercom-enhances-entry-security-by-enabling-the-user-to-recognise-the-potential-entrant-by-audible-means-before-opening-the-door-An-electric-door-catch-not-supplied-Timeguard-part-no-DCLR-order-code-23-9355-is-available-as-an-optional-extra-for-the-DCA1-to-make-the-door-opening-automatic-P-P-The-Timeguard-DCA1-single-channel-audio-door-p