Unique silent designing. Full-automatic intelligent pressure increase and measure. Large screen and big font liquid crystal display ?Large screen and big font liquid crystal display ,indicate of date and time. Slope design and oversized button makes operation easier. Older people can use them more conveniently. Convenient power connections: You can use a dedicated AC power supply Able to store74 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: four 5# batteries, 6v/600mA DC power