Nikon D3300 - Self-Timer Mode

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The self-timer can be used for self-portraits or group shots that
include the photographer. Before proceeding, mount the
camera on a tripod or place it on a stable, level surface.
1 Press the I (E/#) button.
2 Select E (Self-timer)
mode.
Highlight E (Self-timer)
and press J.
3 Frame the photograph.
Self-Timer Mode
I (E/#) button