| 摘要 |
An exemplary USB device includes a base including a body and a pair of arms extending from the body, a head rotatably positioned between the pair of arms, and a pair of wheels fixed to the head. When the base is gripped by a user and oriented at an oblique angle relative to an external surface, with the at least one wheel contacting the surface, and the base is moved by the user in a direction generally parallel to the surface, the head is capable of rotating relative to the base by reason of friction between the wheels and the surface, and the head is opened out from the base and is secured in position at a desired angle with respect to the base when the user ceases moving the base.
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