Vivitar 840XHD Owner's Manual page 33

Note: The Flash will not activate if the batteries are low or if the camera is
being charged.
Selftimer
You can set the Selftimer to up the camera and include yourself in the picture. Place
the camera on a tripod or on a steady and flat surface. After pressing the Picture
Shutter button the photo will be taken 10 seconds later.
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