A: 1. After connecting to the computer, switch on the projector and set the aspect ratio. The aspect ratio of the 85” infrared IWB is 4:3. Besides, you can set the color, brightness, contrast, etc. as needed.

2. Keystone correction, in other words, is whether the projected image is a rectangle. If it is a trapezoid, close the "Auto Keystone Correction" option, select the "Keystone Correction" command, pressing the left and right buttons on the remote control adjust it until the image is evenly rectangular.