MFG is divided into 21XX and 22XX two series of 10 
models. It has mainly 4 different output channels CH1/ 
CH2/ Pulse/ RF to collocate with, CH1/ Pulse is  
standard configuration and CH2/ RF is optional. The 
display position for CH1 is fixed and the display 
position for Pulse changes depending on if the the CH2 
available. 
In order to effectively distinguish various channels, we 
assign  different color to each channel respectively.