| CPC G06F 1/1684 (2013.01) | 10 Claims |

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1. An electronic device comprising:
a casing comprising a pen slot and a first engaging portion located beside the pen slot;
a flexible pen plug detachably disposed in the pen slot, including a door portion, a second engaging portion connected to the door portion, a first wall portion close to the second engaging portion, and a second wall portion away from the second engaging portion, wherein an insertion space is formed between the first wall portion and the second wall portion, and when the flexible pen plug is disposed in the pen slot, the second engaging portion is engaged with the first engaging portion; and
a locking member detachably screwed to the door portion, wherein when the locking member is screwed to the door portion, the locking member partially extends into the insertion space, and is located between the first wall portion and the second wall portion, the locking member is limited by the second wall portion, and thus the door portion secured to the locking member is limited, such that a relative position between the second engaging portion and the first engaging portion is maintained,
when the locking member is moved out of the insertion space, the door portion is released from the limit, and the second engaging portion is adapted to be released from the first engaging portion.
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