HTC One M9 User Manual page 73

Auto launching the camera with Motion Launch Snap
When the screen is off, you can wake up the phone directly to the Camera app.
Press and hold the VOLUME UP or VOLUME DOWN button, and then lift the
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phone in landscape orientation.
Or first lift the phone in landscape orientation, and then press the VOLUME
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UP or VOLUME DOWN button right away.
If you've set up a screen lock with credentials, you'll be asked to provide your
credentials when you exit the Camera app.
Your first week with your new phone 73