Model 500CM: Annunciator Communication Module $1.00 Model 550A-1117: Graphic Annunciator, 11″ x 17″ $1.00 Model 550A-0811: Graphic Annunciator, 8 1/2″ x 11″ $1.00 Model 561R: Rack Mount Annunciator, Unlimited $1.00 Model 503A: Surface Mount Annunciator, Up to 64 Zones $1.00 Model 561B: Desk Top Annunciator, Up to 32 Zones $1.00 Model 561A: Recessed Annunciator, Unlimited $1.00 Model 531C-8: Surface Mount Annunciator, 8 Zones $1.00 Model 531B-8: Surface Mount Annunciator, 8 Zones $1.00 Model 531-8: Recessed Annunciator, 8 Zones $1.00