How to take screenshot on Pantech Vega R3

Brand: 
Pantech
Model: 
Vega R3
Version: 
IM-A850L
Instructions: 

The screenshot on the Pantech Vega R3  is like other smart phones also carried out by means of a key combination. This key combination is as follows:

Pressing and hold simultaneously for a period of two seconds:

Power On / Off button
Volume Down button