Abstract: An MP-3 player includes a first speaker portion in which a speaker is mounted so as to be positioned at an ear of a user, an electric device portion which is mounted in the first speaker portion and provided with electric parts for reproducing sounds from an MP-3 file, a second speaker portion in which a speaker is mounted so as to be positioned at the other ear of the user; and a wearing means for connecting the first speaker portion and second speaker portion which is worn on the user's head. The speaker portions and the main body are integrally formed into a headphone or back-phone arrangement, thereby minimizing the size of the MP-3 player. Further, a separate wire is not needed in the MP-3 player, thereby reducing the trouble such as a short of the wire.

Abstract: An apparatus for opening and shutting a door of an adjusting part, functions of a tape recorder being adjusted by the adjusting part, comprising: a cassette loading means for mounting and dismounting a cassette in a deck, the cassette loading means moving along a loading slot formed on one side of a housing, a door opening means being operated by the cassette loading means to open the door, a resilient means for applying the resilient force to the door, a control means for controlling the resilient force of the resilient means, a door shutting means including a button and a shutting lever. The door may be opened to adjust the picture quality or the one quality only in loading of the tape cassette, otherwise the door may not be opened. Moreover, it may be attained to protect to the adjusted state from the outside and to smoothly open and shut the door according to the present invention.