Specification System performance Power source Four 1.5V AA alkaline batteries Size of monitor w/o cuff 145 (L) x 64.5 mm (W) x 29.6 mm (H) 240g (without batteries) Cuff Size 24-43 cm (9.4 - 16.9 inches) Memory Maximum 200 memory records Power saving Automatic power off if system is idle for 3 minutes Operating Conditions Temperature: 5°C ~ 40°C Humidity: 15% ~ 93% Storage Conditions Temperature: -25°C ~ 70°C Humidity: 10% ~ 95% Power Supply Input DC +6V / 1A (max) via Power Plug Blood pressure measurement performance Measurement unit mmHg Systolic Measurement Range 50 ~ 250 mmHg Diastolic Measurement Range 30 ~ 180 mmHg Pulse Rate Measurement Range 40 -199 beats / minute Accuracy of Pressure ±3 mmHg or ±2% of reading Accuracy of Pulse rate ±4% of reading