Sony ERS-312 - Manual (Page 43)

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Communicating with
AIBO
Communicating visually
A color camera and a distance sensor provide AIBO with sight, allowing it to
recognize colors, movements, and distance to judge them totally.
AIBO reacts best to a pink ball (supplied), a moving substance, your hand, wall or
steep drop.
Note
AIBO may not react to a wall or steep drop.
Distance sensor
Color camera