Dynamic 4-L - 4-Way Large Masking ScreenOn wall projector screen with 4 way motorised masking for visible screen width greater than 420cm up to 540cm The DT Dynamic 4 L is an on wall projector screen optimised for large sizes, featuring 4 way motorised masking and Mask Position logic based control. PRODUCT HIGHLIGHTS: Motorised Variable Width Masking 1. 33 to 2. 40: 1 Sizes 420cm 540cm wide Mask Position Logic Preset free mask position selection RS232 and IP control as standard SES image