| 摘要 |
A flashlight has a barrel formed with a conductive inner surface to retain batteries therein, a head attached to one end of the barrel and having a light emitting module retained inside the head, wherein two electrodes of the light emitting module are respectively and electrically contacted with one electrode of the batteries and the conductive inner surface of the barrel. A tail cap is provided to enclose the other end of the barrel, wherein the screwing rotation between the tail cap and the barrel determines whether an electrical loop is closed or open so as to control the activation of the flashlight.
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