Huawei Mate 8 - Manual (Page 191)

Convenient features, making life easier for you
184
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Touch the screen once to freeze the current screen. Touch again to unfreeze.
•
Double touch the screen to zoom in. Double touch again to revert to the original
screen.
•
When you blow on the microphone, the phone will display a "steamed up" effect on
the mirror. You can wipe the screen to remove this effect.