Name: Fully Automatic Electronic Wrist Blood Pressure Monitor Display Mode: LCD LCD Measurement method: ripple detection method Measurement range: pressure: 0~280mmhg pulse count: 40 times/min~199 times/min Accuracy: pressure: 3mmhg pulse count: 5% Power supply: 2 size 7 batteries Normal operating environment: Temperature 5 ~ 40 humidity 80% RH Transportation and preservation environment: humidity - 20 ~ 55 humidity 10% ~ 90% RH Weight: about 200 grams< /p> External dimension (main unit): 73mm length * 70mm width * 32mm height Safety classification: type B internal power supply Pressurization method: vibrating plate pump pressure adjustment method Quick exhaust method: extremely fast exhaust valve open method Pressure sensing: solid state pressure sensor Pulse sensing: solid state pressure sensor semiconductor