The SLAS-04BD series digital audio switcher is specifically developed and designed by Hunan Shuangln Electronics Technology Co., Ltd. to meet the needs of radio station production and safe broadcasting. It is a broadcast-grade digital audio switching device with intelligent switching and recovery capabilities, widely used in production departments, broadcasting systems, control systems, and transmission systems at various levels of radio stations. The product features three digital, analog audio inputs or AOIP network audio inputs, one built-in backup sound (changeable via SD card), achieving intelligent 4-to-1 switching; it outputs 1+2 digital audio and analog L/R stereo signals, as well as sends three digital and analog audio input signals and the switched audio output to the AOIP network for real-time broadcasting or monitoring. Additionally, based on SNMP protocol, it can achieve remote cloud maintenance and dynamic parameter monitoring, enabling fully automated broadcasting without manual supervision. This product has been tested by the National Radio and Television Administrations Radio and Television Metrology Center, meeting all Class A technical requirements for broadcasting and receiving the National Radio and Television Administrations Certification for Radio and Television Equipment and Materials.