... Power-saving visual presenter 2,Projector delay control 3,A key signal switch 4,Screen up-down 5,VGA/COMPUTER-VIDEO ... located in Shenzhen. Our company is specialized in the production, research and development, and sale and ... audio-visual equipment has four styles and 12 models for customers to choose. Our annual export ... First". Visual Aid Conference System/ electric teaching equipment (AV-2800HVC)