A computer accessory device--USB sharer includes a multiplexer, which is connected to a computer host, a human interface device (HID) chip, which is connected to one output end of the multiplexer, a device output end, which is connected to another output end of the multiplexer; and a busyness detection module, which is connected to the middle of the HID chip and the device output end. The USB sharer may reach a sharing function of "N to 1" by applying N-1 sets of "2 to 1" sharer, in which, at least one "2 to 1" sharer's output end is connected to the device output end and, for other N-2 sets of "2 to 1" sharer, of which at least one output end is connected to the input end of another "2 to 1" sharers.

 
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