Product Details Digital Pressure Readout on LCD displayDual Power Operation (Battery cum USB Adaptor)New Sensor TechnologyEnvironment FriendlyGood Calibration StabilityPulse rate display Low power consumption Mercury Free Emulates the mercury column electronically Uses the Korotkoff Sound method for B.P. Measurement Calibrated with standard U Tube mercury Manometer Environment friendly Dual power operation Model contains Main unit, Velcro cuff, Battery Measurement Unit : mm Hg Resolution : 2mm Hg for LED column and 1 mm Hg for numeric display Measurement method : By Auscultation with Stethoscope Pressure display range : 0 – 280 mm Hg for LED column and 0-300 mm Hg for numeric display Accuracy : +/- 4mm Hg (Pressure) ; +/- 5% (Pulse) Cuff size: 14.5 cm x 51 cm Operating Environment: +10 to +40 degree centigrade Storage environment: -20 to +60 degree centigrade Pressurization: Manually by rubber bulb Deflation: Hand held pressure control valve