Abstract: A rotatable camera device for a POS machine, comprises: a main display screen and a customer display screen; wherein the customer display screen is located behind the main display screen; a placement position is recessed on the customer display screen to accommodate a camera unit that is pivotally connected in a horizontal direction, so that the camera unit is rotatably located on the customer display screen and has at least a first rotational location and a second rotational location, the first rotational location is located in the same direction as the customer display screen, faces a customer end for sale payment and collection on an image big data; and the second rotational location is located in the same direction as the main display screen, is higher than an upper end of the main display screen and faces a cash register for image recognition and booting.

Abstract: A computer system includes a computer device and a power adapter. The computer device is provided with a first signal connector. The power adapter includes a second signal connector, a rectifier and an input/output board module. The second signal connector is pluggably connected to the first signal connector. The input/output board module is electrically connected to the second signal connector for being detachably connected to an external device so as to allow signals to be exchanged between the computer device and the external device.

Abstract: A foldable electric device comprises a first member, a second member and a pivot portion. The pivot portion is used to pivot the first member and the second member. The first member comprises a first cushion pad and a first magnetic component. The first cushion pad is retractably disposed on a surface of the first member. The first magnetic component is installed in the first member, and synchronously moves with the first cushion pad. The second member comprises a second magnetic component. When the first member and the second member are covered together, with the magnetic effect between the first magnetic component and the second magnetic component, the first cushion pad is linked by the first magnetic unit to protrude from or retract into the first member.

Abstract: A foldable electric device comprises a first member, a second member and a pivot portion. The pivot portion is used to pivot the first member and the second member. The first member comprises a first cushion pad and a first magnetic component. The first cushion pad is retractably disposed on a surface of the first member. The first magnetic component is installed in the first member, and synchronously moves with the first cushion pad. The second member comprises a second magnetic component. When the first member and the second member are covered together, with the magnetic effect between the first magnetic component and the second magnetic component, the first cushion pad is linked by the first magnetic unit to protrude from or retract into the first member.