Elite Screens Inc. AF5D-20 Airflex5D Double Lumens Dual-Projector Stacking Processor with Stacking/Scaling/Warping and Built-in QStack Grid System Doubles the brightness when used in 2D stacked dual projector configurations Easy setup & alignment through full-function remote or front panel interface Dual projector configuration greatly enhances picture brightness Input: DVI (1) Output: DVI (2)