An accessory for a mobile device is provided to implement an apparatus through which data transmission and charge of a mobile communication terminal and a computer are performed, and implement an efficient and stable apparatus for expanding functions of the mobile communication terminal. A body part includes a UART(Universal Asynchronous Receiver/ Transmitter) connector and a USB(Universal Serial Bus) connector. The UART connector is connected to a UART port of a mobile communication terminal at one side of the body part. The USB connector is connected to a USB port of a computer at the other side of the body part. An accessory part has a coupling part coupled to one of the UART connector and the USB connector and includes a cable connection part connected to a string for a mobile device at a side of the accessory part. The body part has a fingerprint recognition part for recognizing a fingerprint of a user. The fingerprint recognized by the fingerprint recognition part is transmitted through the mobile communication terminal.
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