HP R818 - Manual (Page 115)

115 Using the Setup Menu
Camera Sounds
This setting affects the sounds the camera makes when you
turn the camera on, press a button, or take a picture. This
setting does affect the audio recorded with images or video
clips.
The default Camera Sounds setting is Low.
1. In the Setup Menu (see
page 113), select Camera
Sounds.
2. Use the buttons to highlight
a setting.
3. Press to save the setting and
return to the Setup Menu.
The new setting remains in effect until it is changed again,
even when you turn the camera off.
NOTE: Camera Sounds is set to Off in Theatre mode.