Specification :

Meicheng SB-4140 VGA matrix switcher especially switches and routs any pathway of pathway VGA signal, from 4 matrix switcher sources to 4 matrix switcher acceptors simultaneously. It features user-friendly front panel dabbing type control buttons and other remote controllers including RS-232 and IR remote controller for ease operation.
This unit also includes a breaking scene stabilizing protection to ensure the routing remains in desired state in the event of unintentional errors within the system. SB-4140 VGA matrix switcher is an ideal solution for trade show, boardroom, conference room, control room, classroom, resort, or entertainment facility center.
http://www.meicheng.com.tw/english/studio/SB-8180.html