Classroom projectors need to be dust-resistant, which is why BenQ has been actively investing in and developing dust-resistant technology for use in its Education Laser Projectors. In addition to using convex color wheel sensors that prevent dust buildup and prolong color performance, these projectors also feature Dust Guard Technology. This includes the use of a magnetic system for timing, making it impervious to dust accumulation and IP5X-certified optical engines that are designed to keep out hair, dust, and fibers. The Dust Guard Pro model can ward off fine particles and is equipped with a sealed optical engine to fully protect chips, color wheels, and other optical components and prevent common projector issues such as spotty projection and color degradation caused by dust. Most importantly, however, Dust Guard Technology helps reduce expenditures and time spent on maintenance, significantly lowering the TCO.