One-button blood pressure measurement. Usage: Place the cuff on your upper arm. Press the middle button, and after 35-40 seconds, the large screen will display your blood pressure and pulse. The blood pressure monitor is exceptionally quiet during both inflation and deflation. Power Supply: Operates with 4 AAA batteries (not included). Auto-shutoff after 10-15 seconds of inactivity. AC adapter (wall plug) NOT included, but cable is included. Connects 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 x Blood Pressure Monitor 1 x Cuff (22-32cm) Instructions Color: White TECHNICAL SPECIFICATIONS: Maximum Number of Measurements: 99 Connectivity: USB Systolic Measurement Range: 0 - 280 mmHg Diastolic Measurement Range: 0 - 300 mmHg Power: Batteries / Mains 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; Stores 99 readings for 2 users (198 total) for history tracking. MEASUREMENTS: Cuff Circumference: 22-36 cm Easy Cuff Cable Length: 30 cm Color: White As shown in the image