Spec Sheet Preview: Alpha Communications® features a complete line of U.L.® Listed DC Class II power supplies to power their intercoms, video-intercoms, nurse-call systems, cameras, relays and various signalling systems and devices. The Alpha Communications® model SS12P 12VDC plug-in switching power supplies offer compact, easy-to-install low voltage DC power sources for use with various Alpha Communications® intercom systems and cameras and other accessories. Primary wire conne …