The Ronan Systems Series X12 Solid State Annunciator Systems are the most versatile window annunciators on the market with the capability of supporting both analog and digital inputs within the same system. The superior mechanical construction and the quality of workmanship, combined with the most efficient electronic designs, have established the X12 Series as the leader in the field of window annunciation. The X12 is the answer, from the very basic to your most complex monitor requirements.