LARGE LCD SCREEN. IRREGULAR HEARTBEAT DETECTION. STORES LAST READING. WIDE RANGE CUFF FITS ARMS 8.7 - 16.5 INCHES. CLINICALLY PROVEN ACCURACY. CONTAINS: BLOOD PRESSURE MONITOR EASY-FIT WIDE-RANGE ARM CUFF QUICK START GUIDE QUICK REFERENCE GUIDE ENGLISH/SPANISH INSTRUCTION MANUAL. 4 AA BATTERIES.