LARGER LCD BACKLIT DISPLAY : 2.7"×2.6" large screen equiped for the bp monitor, high-def backlit. ☆ Irregular Heartbeat Detection. ☆ Pressure :±3 mmHg,Pulse:± 5%. ☆ Pulse:30 to 180 Beats/Minute. 1 PUT CUFF ON BARE ARM : Cuff over clothing adds 5-50 mm Hg.