Abstract: An assembly device for assembling a screw into a locking hole of a circuit board includes an assembled board and a guiding sleeve. The assembled board is configured to press against a circuit board. The guiding sleeve is movably arranged in the assembled board. A vertical channel is formed in an interior of the guiding sleeve. When the assembled board presses against the circuit board, one end of the guiding sleeve abuts against the circuit board, and the vertical channel is opposite to the screw hole on the circuit board. The screw is accurately assembled into the screw hole of the circuit board, thereby improving assembly efficiency.

Abstract: A protective cover for a portable electronic device, which is configured for supporting the device and for storing an earphone and cable, includes a casing body, a winding portion, a limiting plate, and a support plate. The device is received in a receiving portion in the casing body and the winding portion protrudes out of one side of the casing body spaced apart from the receiving portion, the winding portion being able to accept the cable of the earphone wound onto it. The limiting plate covers one side of the winding portion spaced apart from the casing body and defining an opening. The support plate covers the opening of the limiting plate and is rotatably coupled to the limiting plate. A ring-shaped accommodating space is defined between the limiting plate and the casing body for receiving the cable of the earphone wound onto the winding portion.