Unique silent designing Compact body design, more convenient to carry Large screen and big font liquid crystal display Able to store 60 groups of measuring results. Display average value of three measurements. Automatic power-off after 2 minutes to reduce power consumption and extend the service life It is easy to operate, and can display in two modes, mmHg and kPa. Measuring range: Systolic blood pressure: 60?230mmHg (8.0?30.7kPa) Diastolic blood pressure: 40?130mmHg (5.3?17.3kPa) Pulse: 40?200beats/minute Pressure precision: within±3mmHg(±0.4kPa) pulse: within ±5% of reading value Operation manner: intermittent operation Electric safety classification: BF type Displaying model: LCD digital displaying Pressure sensor:semiconductor pressure sensor Pressurized method: automatic pressurized by pressure pump Depressurization:apply automatic air release mode Air release: fast manual air release mode Suitable for wrist circumference: 13.5 to 19.5 centimeters (cm) Power: two 7# batteries Power: two7# batteries