Acer ET2 31.5'' LED Widescreen LCD Monitor with UItra High Definition 4K display and the screen resolution of 3840 x 2160. The 31.5'' wide display provides an excellent blend of colors and an enjoyable viewing experience with clarity and improved detailing. It offers up to 1.07 billion colors and AMD-free sync tearing prevention technology. The vertical alignment enables smooth video and screen transition. The native screen refresh rate is 60 Hz. The response time of this monitor is 4ms and the brightness is 300. It has in-built HDMI and VGA video inputs with 2 HDMI ports. The aspect ratio is 16:9 and the contrast ratio is 100000000:1. It comes with 90-day Limited Warranty.