Blood pressure measurement is taken by pressing a single button. Usage Place the cuff on your upper arm. Press the center button, and after 35-40 seconds, the large screen will display your blood pressure and pulse. The blood pressure monitor is extremely quiet both when the cuff is inflating and deflating. Power Supply The unit is powered by 4 AAA batteries (not included). After 10-15 seconds of inactivity, it automatically shuts off. The AC adapter (wall adapter) is NOT included in the package, but the cable is included. It can be connected to any mobile phone charger with a micro-USB connector. Specifications GENERAL FEATURES Body Area Arms Usage Type Household Operation Type Electronic Function Portable Automatic Shut-off Usage History Package Contents 1 Blood Pressure Monitor 1 x Cuff 22-32cm - User Manual; Color White TECHNICAL FEATURES Maximum Number of Measurements 99 Connectivity USB Systolic Measurement Range 0 - 280 mmHg Diastolic Measurement Range 0 - 300 mmHg Power Type Batteries To the network Battery Type Nimh Batteries Required 4 x AAA (not included) Specifications Blood Pressure: 20 - 280 mmHg with an accuracy of +/- 3 mmHg; Pulse: 40 - 199 bpm with an accuracy of +/- 5%; Adjustable Cuff 20 – 34 cm; Remembers 99 positions for 2 users, totaling 198 memories so you can check your history. MEASUREMENTS Cuff Circumference Cuff 22-36 cm Easy Cuff Cable Length 30 cm Color: White As shown in the picture