... .Low Battery Detector 3.Convenient:Easy to Read,LCD Display 4.CE ISO and ROHS approve Functions:1, One button measuring ... ;2, Big LCD display3, Dual unit: mmHg and Kpa4, 21 data saving5, low battery monitor6, 3 minutes auto shut-off energy ... : Pressure±3mmHg±0.4KpaPulse rate±5% Operating temperature5--40Battery: AA*4 alkaline batteriesBattery life: Approx 2 months (at 3min per day ...