The BenQ LW820ST is designed with Dust Guard technology including sealed laser modules to protect the laser bank. This lock-and-key design hermetically seals the laser engine from dust to prolong the projector lifespan. With a fully enclosed laser light source and an innovative sealed engine design powered by BenQ Dust Guard technology, BlueCore education projectors guarantee 20,000 hours of maintenance-free operation.
||100 ~ 240V AC
||1D keystone, Vertical +/- 30 degrees
||106.1 +/- 2.5%