... of collective control by the central controller can also be stand-alone control. System is the perfect solution to the liquid crystal ... , stability, low noise, waterproof, dust proof and good shockproof performance;4. Our regular size is 17", 19", 21", other size can ... , stability, low noise, waterproof, dust proof and good shockproof performance;4. Our regular size is 17", 19", 21", other size can ...