BX-22 Features:
Two parameters:SPO2, Pulse Rate.
One waveform: SPO2 waveform (PLETH).
64k color OLED Display, Four Direction adjustable                   
SpO2 and pulse monitoring, and Waveform display                          
Easy to use with one-key operation Small in size, and easy to carry Low voltage 

alarm display, Auto power-off        

Light weight of 55g(batteries included)                                                
Runs on standard AAA batteries