How to take screenshot on ZTE nubia N1

Brand: 
ZTE
Model: 
nubia N1
Instructions: 
  1. Open the screen that you want to take a picture;
  2. Simultaneously press Volume down  and Power button  to take a screenshot;
  3. In a second edge of the screen will flash, confirming the creation of the screenshot. You will hear a distinctive sound pictures.
  4. Now, take a screenshot you will find in Gallery (Gallery) or My Files (My Files).

If the process does not work, make sure you press the button at the same time really!