Blood pressure measurement is done by pressing a single button. Usage: Place the cuff on the upper arm. Press the middle button and after 35-40 seconds the screen will show your blood pressure and pulse with large characters. The blood pressure monitor is extremely quiet both when the cuff is inflated and when it is deflated. Power supply: The device is powered by 4 AAA batteries (not included). After 10-15 seconds of inactivity, it turns off automatically. 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 Features Portable Automatic shutdown Usage history Package contents 1 blood pressure monitor 1 x Cuff 22-32cm -User manual; Color white TECHNICAL FEATURES Maximum number of measurements 99 Connection 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; Memory function for 99 positions for 2 users, a total of 198 memories so you can check your history. DIMENSIONS Cuff circumference Cuff 22-36 cm Single cuff Cable length 30 cm Color: White As shown in the picture