BenQ LH830ST 4000 ANSI Lumen 1080P Laser Simulation ProjectorLH830ST 4000 ANSI Lumen 1080P Laser Simulation Projector 0. 5 short throw ratio for large image from short distance One click preset for multi projector blending to minimise setup effort IP6X sealed engine with optional filter for optimal dust resistance and protection Supports OTA firmware updates to keep all devices up to date without physical access Laser high visual 4000 ANSI lumen brightness Optimised for Multi Projector Projects from Fast Setup