With self-lock function, you can stop it at any position you like. The case is very strong with 0.7mm iron plate.
This product is certified by ROHS standard, and is environmentally friendly.
– Self-lock, can stop at any position you like.
– Material of screen case is 0.7mm iron plate used for cars.
– ROHS certified
NTSC or Video Format: 1.0 to 1.33 or 4:3 – The 4:3 or NTSC aspect ratio matches the same screen shape as the traditional (Non-High Definition) television sets or computer (SVGA, XGA, UXGA) resolution. The dimensions of 4:3 are identical to the field of vision for a pair of human eyes. Despite its longevity, this format is being phased out in favor of 16:9 and 16:10 aspect ratios for tv and projectors in both home add commercial design. Select this format screen if you are using a native SVGA, XGA or UXGA projector for your presentations. This is also ideal for either older or lower cost commercial projectors as they may likely have a native NTSC format.