Blood pressure measurement is done with a simple push of a button. To use: 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 during both inflation and deflation of the cuff. Power supply: The device is powered by 4 AAA batteries (not included). It automatically shuts off after 10-15 seconds of inactivity. A power adapter (wall adapter) is NOT included in the package, but the cable is. It can be connected to any mobile phone charger with a micro USB connector. Specifications: GENERAL CHARACTERISTICS Body area: Arms Type of use: Household Operation type: Electronic Function: Portable, Automatic shutdown, Usage history Package contents: 1 blood pressure monitor, 1 x Cuff (22-32cm), User manual Color: White TECHNICAL CHARACTERISTICS Maximum number of measurements: 99 Connection: USB Systolic measurement range: 0 - 280 mmHg Diastolic measurement range: 0 - 300 mmHg Power type: Batteries, Mains power 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: 99 positions for 2 users, total 198 memories to check your history. MEASUREMENTS Cuff circumference: 22-36 cm (Easy Cuff) Cable length: 30 cm Color: White (As shown in the picture)