Bohai Radio Factory, Electronic Engineering Department (herein retied to as EED) specializes in reseeding & developing professional public address system equipment and carrying out the radio engineering project for metro, light track, and railway stations, being the pioneer in China to apply microcomputer technology and PCM system in railway and metro PA systems, EED has accomplished antomatization of public addressing and remote control of management network. Technology of public address product has been unceasingly improved and upgraded to apply to various major metro engineering projects. EED guarantees to provide high quality and high intellectual products and satisfactory after sales customers service. Our promise is well accepted by customers.