A portable device includes a portable device body, a touch panel provided on a surface of the device body, and a cover pivotally coupled to the device body for covering the touch panel when it is closed and uncovering the touch panel when it is opened. The portable device further includes a window provided at the cover to allow the touch panel to be seen through the window when the cover is closed. The portable device further includes a button provided at a position on the cover corresponding to the touch panel. The button is operable from an outer side of the cover to control an operation of the touch panel while the cover is closed. A concentrator includes a concentrator body and a device receiving unit attached to the concentrator body for receiving therein the portable device so as to perform data transmission and reception and/or power feeding relative to the portable device. The device receiving unit is capable of receiving the portable device of any size within a given range and performing the data transmission and reception and/or the power feeding relative to the portable device received therein.
