Abstract: A card-type USB C transfer device, which includes a first connection interface for coupling and electrically connecting a portable power source, a second connection interface for coupling and electrically connecting at least one external device, an internal circuit electrically connected to the first connection interface and the second connection interface, and been configured to provide more than one power transmission paths between the portable power source and the external device, wherein the portable power source is detachably coupled to the card-type USB C transfer device through the first connection interface.

Abstract: The present invention provides an antenna rotating head with a double grooves structure. The antenna includes an antenna body and an antenna rotating head. The antenna body receives signals. The antenna rotating head coupled to the antenna body. The antenna rotating head comprises a rotor, a housing and a base. The rotor has at least one groove, wherein the rotor is free to rotate. The housing coupled to the rotor to prevent the rotor from falling off. The base coupled to the housing to fix the housing. The rotor further comprises a rotor head, a rotor disc and a rotor body. The rotor head fixes the antenna body. The rotor disc coupled to the rotor head to abut against the housing. The rotor body coupled to the rotor disc, wherein the at least one groove is located on the rotor body.

Abstract: The present invention provides an antenna rotating head with a double grooves structure. The antenna includes an antenna body and an antenna rotating head. The antenna body receives signals. The antenna rotating head coupled to the antenna body. The antenna rotating head comprises a rotor, a housing and a base. The rotor has at least one groove, wherein the rotor is free to rotate. The housing coupled to the rotor to prevent the rotor from falling off. The base coupled to the housing to fix the housing. The rotor further comprises a rotor head, a rotor disc and a rotor body. The rotor head fixes the antenna body. The rotor disc coupled to the rotor head to abut against the housing. The rotor body coupled to the rotor disc, wherein the at least one groove is located on the rotor body.

Abstract: A shock-resistant magnetic storage medium includes a circuit protection module coupled between a power converter and a magnetic disk assembly. The circuit protection module includes an acceleration sensor for generating output signals that indicate a falling state of the magnetic disk assembly, a switch operable so as to make or break a circuit connection between the power converter and the magnetic disk assembly, and a processor for controlling the switch to break the circuit connection between the power converter and the magnetic disk assembly based on the output signals from the acceleration sensor so as to interrupt supply of electric power to the magnetic disk assembly when the magnetic disk assembly is dropped.