Specification:
1>Rated voltage: DC6V (4*AA batteries ), usb5V adapter.
2>Measurement range and accuracy: 0 ~ 299mmHg, +-3mmHg. 
3>Pulse range and accuracy: 40 ~ 180 times / min,5%. 
4>Cuff circumference range of 22-32cm. 
5>Dimensions: 132*112*70.5 mm.
6>Weight:   410g                                                                        
7>LCD viewing area: 3.5 inches 
Feature:
Oscillometric method, Auto inflation 
One button to operate. Power off without operation in 30s.  
Auto inflation and deflation. Battery low indicator 
Voice broadcast during whole course 
2 x 99 sets of measurement value in memory