GNC Digital Arm Cuff Blood Pressure Monitor. Large LCD screen. 90 # Memory. Body Movement Indicator. Average calculating for the last 3 measurements. Irregular heart beat detection function. Blood pressure classification indicator. Automatic inflate and deflate. Powered by 4 AA size Alkaline batteries. Automatic power-off function. Measuring range: Pressure - 0mmHg-299mmHg; Pulse - 40-199 times/min. Measuring accuracy: Pressure: +/-3mmHG; Pulse: +/-5% of reading. Dimensions 5"x8"x3.25"