Abstract: The present disclosure provides an angle adjustment structure for adjusting an angle of a body relative to a base. The angle adjustment structure includes a positioning member and a locking member for locking with the positioning member, the body is rotatably connected to the base, and the body is provided with at least two of the positioning members, and the locking member is movably disposed on the base, and the locking member and the positioning member are locked or unlocked by means of movement of the locking member. In addition, the present disclosure further provides an child carrier having the angle adjustment structure. The child carrier of the present disclosure can bring a variety of different visual experiences for the child on the body, and also at the same time help the caregiver for taking care of the child, and has a simple structure and is easy to operate.

Abstract: This disclosure provides a top cover for a base, a base for a child safety seat and a child safety seat, wherein the top cover comprises a top cover body, an upper surface of the top cover body is provided with a protrusion located at a front end of the top cover body, and the upper surface of the top cover body is further provided with a seat area located on a periphery of the protrusion for a child to sit. In the top cover this disclosure, a protrusion is provided on the upper surface of top cover body of the top cover, a protrusion can block a forward movement of a child sitting in the seat area when an accidental impact occurs, reducing a pressure on the child's abdomen due to the accidental impact, and making the child sitting on the top cover safer.

Abstract: Embodiments of the present invention provide a method for data transmission between a switch and a terminal, which includes: transmitting data between the switch and the terminal in a bidirectional Frequency Shift Keying (FSK) mode. The embodiments of the present invention provides an FSK processing module, a terminal, and a switch as well. Owning to implementing service data transmission in the bidirectional FSK mode, the speed of the information transmission between the switch and the terminal is greatly improved so as to provide support for developing interaction services with a great amount of data between the switch and the terminal in communication plane.