Abstract: A hands-free device comprises a receiver having a speaker enclosed therein, a hose having one end coupled to the receiver, an enclosure at the other end of the hose and including a hole through the surface, a plug, and a first cord having one end coupled to the plug and the other end coupled to the speaker. Signals from an external communication device coupled to the plug is sent to the speaker through the first cord. The signals are then converted into voice in the speaker prior to transmitting to the enclosure through the hose. Finally, voice is outputted from the hole. Receiver is disposed away from the brain. Hence, the brain is not subject to electromagnetic wave generated by receiver while telephoning.

Abstract: A piezoelectric microphone comprises a band, a cable, a voice receiving device in contact with a voice source being connected to one ends of band and cable, a plug at the other end of cable, and a voice output device. Microphone is held to a voice source by band. Sound waves from the voice source are converted into a signal in the voice receiving device prior to sending to the voice output device through cable. Then the signal is converted into voice in voice output device for output. With this, outside sound is prevented from coming through the voice receiving device. That is, outside sound can not be transmitted to voice output device through voice receiving device and cable. Hence, the voice receiving device only receives sound waves from the voice source, resulting in a clear voice output through the microphone.

Abstract: A retaining base for hanging electronic device comprises a clamping plate being coupled to a hanging member through a spring clip. The hanging member has an accommodating recess on one side for receiving two corresponding movable embedding members each having one end passing through an opening thereon and extending to a latch groove disposed on another side of the hanging member, and a board with one end inserted into the gap between the embedding members. When the board being pressed, the embedding members will move in the directions opposite to each other and then latch a hanger of an electronic device being placed into the latch groove.

Abstract: A joystick device for cellular phone comprises an upper fastening member on the keypad being clung onto the cellular phone and including a first central aperture and a plurality of openings around the aperture; an abutment member between the upper fastening member and the keypad and including a second central aperture, a plurality of projections around the central aperture thereof each being received in the opening but leaving a gap therebetween for providing an operating allowance, and a plurality of bottom studs each corresponding to one of the projections; and a joystick passed through the first central aperture and firmly fixed to the second central aperture of abutment member; whereby the joystick is operative to move to one of up, down, left, and right directions for causing one stud to contact a direction key on the cellular phone while playing due to the allowance. This can increase operation speed.

Abstract: A back-clip structure includes a movable piece provided with an embedded groove on one side of the movable piece and a body on the other side adjacent to the end edge thereof. The movable piece can be against the body or rotated pivotally away from being against the body, the side of body opposite to the movable piece is provided with a clip piece, and an elastic device is provided between the body and clip piece to let the clip piece be clipped onto a waist belt of a user. While the embedded groove is inserted with a hanging rivet provided on a mobile phone, the display of the mobile phone can directly be viewed through lifting the movable piece.