Measuring Method : Oscillometric System Range : Pressure:0~300mmHg; Pulse:40~ 200/min. Accuracy : Pressure ±3 mmHg; Pulse ±5% Power Source : DC 5V from USB port of computer. Power Consumption : 2W Operating Systems : Microsoft Win 7, Vista, XP or 2000 Working temp. & Humidity : 5 ~ 40℃, 30 ~ 85% RH Storage temp. & Humidity : -20 ~ 60℃, 10 ~ 95% RH Dimensions : 148(W) X 46 (D) X 50 (H) mm Weight : Approx. 150g Accessories : USB Transfer Cable, Storage Bag, Arm Cuff, User Instruction Manual, USB BPM Software CD Place of Origin : Made in Taiwan Lead Time : 40 ~ 45 days Dimensions : 148(W) X 46 (D) X 50 (H) mm Weight : Approx. 150g.