HERS MEDICAL designed to be comfortable and easy to use. Once the cuff is placed in the proper position on the wrist, the user presses the start button. The cuff will automatically inflate, then deflate, and give an accurate blood pressure reading in approximately 45 seconds. Record your results and discuss them with your doctor. Monitoring your blood pressure and understanding how to lower it when it's high, is an important part of managing your health. HERS MEDICAL is committed to making high quality, innovative products to meet the needs of you and your family. One-touch automatic inflation and deflation. Large LCD display with date and time. Step vale technology. 2-person zone, auto 30-reading for each zone. 60 Memory, 2 person use with date & time. Power saving, automatic shut-off in 3-minutes. Operates by 2"AAA" Batteries. Compact design easy for carry and measuring. SPECIFICATION: Measurement Type: Oscillometric. Measurement Range: Pressure 20 - 280mmHg Pulse 40 -195 beats/min Accuracy: Pressure within ?mmHg Pulse rate-within ? % of reading (Subject to the temp/humidity) Inflation: Automatic inflation with pump Deflation: Automatic Pressure Realease Valve Pressure Detection: Semiconductor Power Supply: 2 x AAA Batteries Auto Power Off 3 min. after last key operation. Oper. Temp/Humidity: + 10℃ to +40℃. 10% to 85% RH. StorageTemp/Humidity: -20℃ to +60℃. 10% to 95% RH Weight of Main Unit; APPROX. 120G(ex.batteries) ExternalDimension: 80(L) X 85(W) X 35(D)mm Wrist Circumference: 135-220mm