... TV 3.light, curtain 4. projector Multimedia Control System Multimedia Control SystemFeatures:1. 3 VGA input, 4 video ... output, audio synchronous switching2. Waterproof and dustproof membrane control panel3. Built-in broadband distributor, output resolution up ... other device) Projector screen power: 1 (internal relay, controlled) Projector power: 1 (internal relay, controlled) Serial port: RS232 ×1 ...