Abstract: A method for granting access to change a security system from a locked state to an unlocked state is provided. The method includes: displaying a security access interface on a display unit, wherein the security access interface comprises a first image input field and a second image input field; selecting one first image and at least one second image; moving the at least one selected second image to the selected first image; recording at least one property in relation to the selected first image and the at least one selected second image; generating an input password according to at least one of the at least one recorded property; determining whether the input password matches a predetermined password; and granting access if the input password matches the predetermined password. A related security system is also provided.

Abstract: A portable electronic device includes a navigation key assembly, a memory unit, a processing unit and a display unit. The navigation key assembly includes a knob. The memory unit is configured to store an electronic file. The processing unit is electrically connected to the navigation key assembly and is configured to store a predetermined rotation angle within which the knob rotates, and to obtain a total page of the electronic file and a rotated angle of the knob, and to determine how many pages jumped to according to the total page, the predetermined rotation angle and the rotated angle of the knob, and to obtain corresponding contents of the page jumped to. The display unit is configured to display the corresponding contents of the page jumped to.

Abstract: A wheel for a toy vehicle includes a rim, a tire, and a ballast. The rim includes an outer circumferential surface. The tire is attached to the outer circumferential surface of the rim. The tire and the rim cooperatively define a ring-shaped receiving channel therebetween. The ballast is received in the ring-shaped receiving channel, and slidably connected to the outer circumferential surface of the rim. The weight of the ballast is greater than the frictional force between the ballast and the rim.

Abstract: A media playing system includes a media reproducing apparatus and a decoding server. The media reproducing apparatus capable of receiving a play command for reproducing a selected media file, and configured for determining whether the media reproducing apparatus can decode the selected media file, and transmitting an unsupported media format message when it is determined that the media reproducing apparatus cannot decode the selected media file. The decoding server communicatively coupled to the media reproducing apparatus, the decoding server capable of receiving the unsupported media format message from the media reproducing apparatus, and configured for invoking a decoding program according to the unsupported media format message to decode the selected media file to generate media data that can be reproduced by the media reproducing apparatus, and transmitting the generated media data to the media reproducing apparatus for reproducing by the media reproducing apparatus.