Brand New units with many features. Alert Limits Operator selectable, automatic or menu selected High and Low limits for SpO2 and Pulse Rate, continuously displayed. Visible alert is immediate, audible alert occurs 10 seconds after violation of set limit. Two-Minute Silence When Audio key is pressed, audible alerts are deactivated for two minutes. Indicated by illuminated 2-Minute LED. Audio Off Press and hold Audio key for three seconds to deactivate audible alerts. Indicated by flashing Audio Off LED. Trend Memory 24-hour trend memory capacity, battery backed. On-screen 12 hr., 8 hr., 2 hr., or 30 minute graphical and histogram displays. User defined Events are stored in memory. Trend and histogram information can be printed. NovaCARD Data Archive System Compatible with NovaCARD, a Computer Archive, Recall and Display system for storing, printing, and analyzing patient data.