Patent ID: 8260379

Claim:
A mobile electronic device comprising: a main body to which a reading device of a storage medium or a communication module is detachably coupled; an accommodation chamber formed in the main body to alternatively accommodate the reading device and the communication module when one of the reading device and the communication module is alternatively coupled to the main body; and a connection port disposed in the accommodation chamber, configured to be electrically connected to the reading device or the communication module, wherein the communication module comprises: a plurality of antennas configured to transmit and receive radio signals; a circuit board disposed within the communication module and connected to the antennas to process the radio signals; and a communication port configured to connect the circuit board with the connection port; wherein the main body comprises: a first body including user input unit disposed on a front surface thereof in order to receive a control command; a second body rotatable coupled with the first body and having a display area of a display; and an opening of the accommodation chamber formed on the side of the first body.