If you want to capture an image (screenshot) display exquisite HTC One, you do not have one but up to two options how. We will explain what these two options.
The first option is using the same method used in previous versions of HTC devices: press the power button, leave it tight and then press the HOME button. You will hear the sound of the camera followed by a confirming image capture message.
The second option starts the same way, let down the power button, but then press the button to lower the volume.
You can see all the images captured in implementing GALLERY. Choose the option at the top left to view the albums (ALBUMS) and you can see an album called "Screenshots".