Electronic Blood Pressure Monitor With Voice Function plus USB cable

Features:
The clock feature intelligent pressure LCD digital display,legible and irregular heartbeat tips, WHO warning message function the overpressure protection function.Voltage power detection,Low power consumption double mode, 90 set of measurements of memory
Serial port (optional)
Using the oscillometric blood pressure measurement measures the blood pressure accurately 

Specification:
Condition: new 
Product size: 71*73*32mm 
Wristband range: 135~195mm. 22-42cm. suitable for all slim, fat, plus size, bulky persons.
Display: LCD digital display screen 
Measurement range: blood pressure 0~280mmHg pulse 40~199 times / min 
Compression method: automatic pressurizing pump 
Reducing the way: solenoid valve control pressure 
Measurement error: blood pressure + 3% heart rate + 5% 
Memory capacity: 90 sets of measurement data and time 
Pressure sensing: semiconductor pressure sensor 
Power supply: 4 1.5V AAA battery 
Measurement interval: 1mmHg 
Operating temperature and humidity: ~+40 C +10 C /40%~85%R.H. 
Preservation of temperature and humidity: +50 C -20~ C /15%~90%R.H. 
Weight:700g

Notes:
The wristtype electronic sphygmomanometer is sensitive, so it is necessary to maintain a correct sitting posture during the measurement process. 
After 5-10 minutes of rest, keep breathing evenly, and the measurement site and the heart site should be at the same level. 
Usually, the measurement of the wrist is higher than the measurement