Free Express Shipping! Acer AOPEN 21E1Y bi 23.8" IPS Monitor 23.8" 16:9 IPS Panel, HDMI - VGA, 1920 x 1080 at 75 Hz, 5 ms Response Time, 1000:1 Contrast Ratio, 250 nits of Brightness, 16.7 Million Colors, 72% NTSC Color Gamut, 75 x 75mm VESA Mounting