Automatic digital Wrist Blood Pressure monitor-02 Accuracy:Pressure:±3mmHg(±0.4Kpa) Heart rate error:Pulse rat:±5% Environment: Operating temperature:5--40°C Display: Big LCD display Battery: Four DC1.5V alkaline batteries Weight: Approx. 110grams Alarm:Buzz Functions: 1,One button measuring procedure, including display and saving 2,Big LCD display 3,Dual unit: mmHg and Kpa 4,Last measuring data saving 5,low battery monitor 6,3 minutes auto shut-off energy saving