| CPC H04B 1/3888 (2013.01) | 9 Claims |

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1. A protective case, applied to assemble to a handheld electronic device, comprising:
an inner surface;
an outer surface;
a connector, disposed at the inner surface to electrically connect to the handheld electronic device, and comprising a plurality of signal transmitting pins;
a plurality of first detachable connecting structures, arranged in a first array on the outer surface, the first array being arranged in both vertical and horizontal directions on a larger portion of the outer surface; and
a plurality of first electrical connecting structures, arranged in a second array on the outer surface, and electrically connected to the signal transmitting pins respectively, the second array being arranged on a remaining side portion of the outer surface;
wherein the first array has a first spacing distance, the second array has a second spacing distance, and the second spacing distance is smaller than the first spacing distance.
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