With a refresh rate of 60Hz and response time of 5ms, the Acer S220HQL 22 Class Widescreen LED HD Monitor will make your images come to life in front of your very eyes. Backed by Acer's patented LED backlit technology, the Acer S220HQL 22 Class Widescreen LED HD Monitor can achieve a dynamic contrast rate of 100,000,000:1 for the deepest blacks and brightest white imaginable.