The SNS21 is a screen designated for use by BenQ, that is suitable for use in brightly-lit rooms. Due to the wide array of projection screens on the market, BenQ cannot guarantee the effectiveness of screens other than the SN21, which has been specially designed by BenQ's lab to work with the V5000i. As such, we can guarantee that in a brightly-lit room, the visuals and colors produced by the V5000i coupled with an SN21 screen are as detailed and true-to-life as can be.