Oscillographic method, 【 boost 】 measurement; Using a dual  V DC micro air pump for pressurization (one pre pressurization and one pressurization measurement), the  V DC rapid exhaust valve leaks; Semiconductor resistive sensors for pressure detection.
Power and voltage operating range:
6VDC/4 1.5V batteries/5VDC or 5VUSB voltage working range 4.4VDC -6.0VDC;
5VDC or 5VUSB or 3.7V lithium battery voltage operating range 3.6VDC -5.0VDC
Measurement range and accuracy:
Pressure range: [0-295mmHg (0-39.3kPa)], accuracy ± 3mmHg (± 0.4kPa);
Pulse rate: 40-180 beats/minute, with an accuracy of ± 3%.
Sleep power consumption requirements:
Under rated working voltage, shutdown current ≤ 30uA
1-5 touch or touch buttons for selection
Display mode: color TFT, LED screen, LED digital screen, LCD code break screen optional
Voice function: Chinese, English, and other national voices can be achieved. With volume control and alarm function
Memory function: can be achieved for up to 2 * 240 groups
Communication interface: USB2.0, IIC, UART