Dell XPS 18 (1810, Early 2013) - Manual (Page 9)

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Feature Functionality
1 Right foot Fold outwards to allow your computer to
CAUTION: Not for use in stand upright, fold inwards to allow your
portrait mode computer to lay flat.
2 Left foot Fold outwards to allow your computer to
CAUTION: Not for use in stand upright, fold inwards to allow your
portrait mode computer to lay flat.
3 SD-card slot Full-sized SD-card slot.
Features │ 9