The feature of blood pressure monitor :

Large LCD display;
One-touch auto inflate;
Method of measurement automatic oscillometric system;
Short measurement time;
Blood pressure/pulse rate display
Date and time display
Low battery display
Operating environment: 50-104°F, 15%-90% RH;
Storage environment: -4°F to 140°F, 10% to 95% RH;
Power source: 2 \"AAA\" or 4 “AA” batteries;
Auto power off in 150 sec;
Battery life: approx. 250 usages;
Life time: normally 10, 000 times.