Specifications Display mode:LCD Digital Display Measurement method:Oscillographic measurement method Measurement range:Pressure:0~280mmHg (OkPa-37.3kPa) pulse: 40~199 beats /min Accuracy:Pressure: Within+3mmHg pulse:Within+5% Unit:mmHa/kPa Power supply:USB DC5V or 4 pcs AAA batteries(Batteries and USB cable not included) Automatic power off function:Without operation for 1 minute Operating environment:5 ~40°C ,15%RH~80%RH Storage temperature:-20~55°C ,10%~93%RH Weight: About 330 g/0.72 lb Cuff circumference range: 22-32cm. Package Size: 11.0* 8.2 * 15.5cm/ 4.23 * 3.15 * 6.10 Inch Package Included: 2 x Blood Pressure Monitor 2 x Cuff 2 x User Manual.