Guangzhou audio conference control, as the U.S. M9800 features: 
 - 4 way independent RS232 receiver port, RS232 output interface 7 Road one-way, 2-way RS485 Interface 
 - Built-in infrared port: 4, 3.81mm interface, can independently control the infrared remote control devices, infrared through the front panel buttons and indicator lamps for self-learning, easy to operate. 
 - Built-in WLAN port, card slots, optional card can be upgraded to network remote control 
 - Support for wireless / wired wall panels, wireless / wired touch screen, computer software, network control and other means control 
 - Built-in AV6X3 full tangent matrix, 3-way stereo volume control asynchronous 
 - 2 Way weak relay interfaces 
 Business Consulting: Health and Wei, Mobile: 13416154760;