The HP E231i is a monitor that offers 8ms response time and a contrast ratio of 1000:1. The model's 23-inch LED LCD display supports a resolution of up to 1920x1080 pixels and an aspect ratio that equals 16:09. Furthermore, the brightness level can be set to 250 cd/m² for displaying vivid images. Some of the implemented features include: USB Hub, Energy Saving Mode. This monitor connects to the video source device via its embedded VGA D-Sub, DVI-D, USB 2.0 digital video input connectors.