| 摘要 |
A portable charging device includes a housing having a space for receiving the mobile phone and having one or more prongs for plugging to the mobile phone, a circuit board secured in the housing, a speaker coupled to the circuit board for generating sound waves, and a battery engaged in the housing and coupled to the circuit board for energizing the speaker. The mobile phone may be easily carried by the users with the housing, and may be easily secured to the vehicle and may be electrically coupled to the battery of the vehicle via the circuit board.
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