Applicable arm circumference 22 cm ~ 32 cm Display method LCD digital display Measurement methods Oscillometric method Measuring range Pressure: OmmHg-295mmHg (OkPa ~ 39.9kPa) Pulse: 40 beats / min-195 beats / min precision Pressure: 3 mmHg ( 0.4 kPa) Pulse: 5% current source DC6V-.4XAAA or DC 5V-- battery, via the Micro-USB port Storage and transport Temperature : -20 C ~ 55 C. surroundings Relative humidity: 10% to 93% RH. The atmospheric pressure range is 50kPa 106kPa; normal work Temperature: 5 C ~ 40 C. Relative humidity: 15% -80% RH, Atmospheric pressure range is 70kPa 106kPa; appearance 115mm X 96mm X59mm (length * width * height) Component Display, arm sleeve, storage bag, user manual, (Battery, Micro-USB cable and adapter are not included, please buy them yourself.) Voice broadcast / easy to hear and understand Dual memory with 99 groups automatically stores measurement results, so you can keep in mind the blood pressure daily value. When measuring blood pressure, heart rate is also tested, which is versatile. Package includes: 1 * sphygmomanometer (black, without battery) Pay attention: Due to manual measurement, please allow slight dimensional tolerances Lighting in photography may cause chromatic aberration from life real