HP PW550 - Manual (Page 47)

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Icon Item Description
Pre-composition
This feature captures a image temporarily as a reference. Full press
shutter after referring the subject to the reference point.
Couples Portrait
This feature uses face tracking to auto detect faces to capture portraits
photos without the help of others. When over two faces are detected, AF
is automatically activated. The camera starts count down and captures a
picture in two seconds.
Video
This mode is used to record video clips. Slide the mode selector switch
to the Video icon to enable this mode.
Voice REC
This mode is used to record audio clips. Slide the mode selector switch
to the Voice Record icon to enable this mode.