The horn is usually composed of a head-shaped plastic similar to an animal cow and a square needle. The difference between the horn connector is that the simple horn has more buckles on both sides. According to the requirements, the peripheral dimensions of the horn connector are commonly used in 1.37 pitch, 2.0 pitch, and 2.54 pitch; the diameter of the square pin used is also changed according to the pitch. The bottom and PCB contact surface can be designed as SMT patch or DIP in-line 180 degrees. Function: After the horn is soldered on the PCB board, the IDC cable of the corresponding specification is connected, and then the circuit is connected with another circuit to meet the designer's demand, which is usually used to transmit control signals and weak current.