This high quality 21, 5" LCD monitor has a toughened safety glass fitted behind the bezel. It offers 8H hardness rating, capable of resisting above normal pressure & impacts to the display. The high end LCD panel with LED backlights not only reduces the power consumption it also offers a bright image with high contrast. The Pro Lite P2252HS meets the increasing demands for Protected Economical LCD′s within Education, Retail & Industrial applications & can also be used for CCTV through HDMI input. LED-Backlit A typical CCFL LCD uses four backlight lamps. Using LED diodes considerably lowers the power consumption & reduces the CO2 emission into the environment making this LCD a true ECO-Friendly product. ACR Contrast Ratio is a measurement of this difference between the blackest black & the whitest white your LCD can display. Advanced Contrast Ratio is a feature that automatically adjusts the contrast & brightness based on the darkness of the image. The higher the ratio, the better your screen will look when you have the lights off in a room. HDMI HDMI stands for High-Definition Multimedia Interface. Much smaller & more convenient than DVI, HDMI also has the significant advantage over DVI that it supports audio as well as video signals. VESA VESA mount compliance means you can easily mount your monitor to a wall. Full HD With true 1920 x 1080p resolution your LCD is ready to display any high definition images. It also offers you much more viewable area than a standard LCD with 1280 x 1024 resolution. Speakers This LED monitor is equipped with two high quality stereo speakers. Over Drive ON / OFF When very fast graphics are displayed your monitor can sometimes get blurry. Turning on the Over Drive feature will eliminate that.