Abstract: A portable sound device having a main body having an earbud holder, an earbud detachably mounted in the earbud holder for outputting a sound, a main board located in the main body, the main body being connected to the earbud via a sound cable, and a rotary module mounted in the main body is provided. The rotary module includes a shaft fixed to the main body, a bobbin rotatable about the shaft, the sound cable being wound around the outer circumferential surface of the bobbin, a reel spring providing rotary force to the bobbin, a track having a concave part, the track being rotated with the bobbin, a guide plate having a guide slot, through which the shaft extends, the guide slot extending in one direction, and a bump protruding from the guide plate so as to be inserted into the track.

Abstract: A portable sound device having a main body having an earbud holder, an earbud detachably mounted in the earbud holder for outputting a sound, a main board located in the main body, the main body being connected to the earbud via a sound cable, and a rotary module mounted in the main body is provided. The rotary module includes a shaft fixed to the main body, a bobbin rotatable about the shaft, the sound cable being wound around the outer circumferential surface of the bobbin, a reel spring providing rotary force to the bobbin, a track having a concave part, the track being rotated with the bobbin, a guide plate having a guide slot, through which the shaft extends, the guide slot extending in one direction, and a bump protruding from the guide plate so as to be inserted into the track.

Abstract: A portable battery charger includes a rechargeable battery, a control board electrically connected with the rechargeable battery so as to control charge and discharge of the rechargeable battery, a middle case including an accommodation portion for accommodating the rechargeable battery and the control board mounted therein, a first case and a second case, which are coupled to the middle case and define the outer appearance of the portable battery charger, coupling hooks provided at a first edge and a second edge of the first case and including hook projections provided at respective ends thereof, coupling grooves formed in a first edge and a second edge of the second case so that the coupling hooks are inserted into the coupling grooves, and overflow holes formed in the coupling grooves so as to be open toward the middle case so that the hook projections are inserted into the overflow holes.

Abstract: There is provided a self-defense spray. The self-defense spray an audio terminal that transmits at least one signal to an electronic device capable of taking a photograph, and is connectable to the electronic device; a connecting portion connected to a container storing a liquid; a nozzle that sprays a liquid material from the container; and a button that simultaneously controls the nozzle so that the nozzle sprays the liquid material, and transmits a signal for taking a photograph to the electronic device through the audio terminal in response to being triggered. The invention can provide a self-defense spray which may be carried all the time, functions without a separate battery, and is effective in crime prevention by photographing a criminal, and a method of controlling an electronic device using the self-defense spray.