The Pro Lite E2273HDS is a LED-backlit monitor. It is a full 1920x 1080 high definition 21.5" display that features all the benefits this technology affords. Extremely slim & stylish in design, it has a narrow bezel & is finished in the latest glossy-black. The high specifications of the monitor include 5, 000, 000:1 ACR, fast 2ms response for excellent sharpness in high definition video & triple input connectivity (including HDMI). Power consumption is only 21W typical usage & 0, 5W in standby. 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.