The power supply: 300mA battery Display modeLCD digital display Measuring wayOscillography Measuring rangeBlood pressure: 0kpa~37.3kpa( 0 mmhg~- 280mmhg) heart rate: 40 times /min ~185 times /min; Accuracy of measurement Static pressure:+/-0.4kPa(+/- 3mHg) heart rate: +/-5% of the reading value Storage and transportation environment: Temperature:- 10 C-+55 C:Humidity: 10% 5 93% RH: Normal working environment: Temperature: 5 "C to 40 C; Hurmidity:15% to 85% RH Operating atmospheric pressure: 80 kpa to 105 kpa Run and store atmospheric pressure: 50 kpa to 105 kpa Measurable wrist circumference: About 13.5 cm-19.5 cm Weight: bout 100g Security classification: Internal power class B application part inflatable way: The automatic inflatable Quick exhaust: Electronic venting valve Leak device: vent valve Number of sets of memory: Measurement data can be stored (double 99 group memory) Unit conversion: Blood pressure value was converted in mmHg/Kpa The results showed: High pressure/ low pressure/ heart rate Low electrical testing: LCD display