1: 1 или 4: 3 Штатив Проекционный экран / проектор с

1, The particular auto locking system keeps the screen smooth and flat, look like very beautiful and luxurious. 2, High quality fabric offers clear and vivid image.3, the alloy or steel tripod is stable, nice and convenient to move 4. Gain: glass beaded (2.8), matte white (1.2). 5. Viewing angle: glass beaded (35 degree), matte white (55 degree). 6. Model: 1:1or 4:3 format can be chosen, we can produce according to your demands.7. It is suited for various places such as business affairs, show, schools, mini-type convention, etc.