| 摘要 |
A wrist worn device is provided. The wrist worn device includes a cover, a case, and a rotatable ring. The case is coupled to the cover. The case includes a switch. The rotatable ring is rotatably arranged between the cover and the case. A number of protrusions protrude from the surface of the rotatable ring. Each protrusion can move together with the rotatable ring to a position to actuate the switch.
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