Size: 65*78*28MM N.W.:128g(include battery) Feature: 1.Measuring range: 0-300mmHg 2.Measuring accuracy:+/-0.4kPa(3mmHg) 3.Min scale: 0.1kPa(1mmHg) 4.Memory: 60 Group memories 5.Auto shut-off 6.Battery: AAA*2,Alkaline Batteries 7.Battery life:Approx. 2 months with 3 minutes usage per day 8.Auto -measure