<b > ★Important Tips★ </b> <br> <br> 1) All home theater projectors work optimally in a dark environment and the edges of the screen are slightly less sharp than in the center,When the edges of the image are blurred:<br><br>-Adjust the focus wheel until the picture is clear.<br>-Adjust the keystone correction wheel until the screen is square.<br> <br> 2) Due to copyright reasons,If there is no sound when playing videos from Netflix,Hulu ect, Please turn off the Dolby.<br> <br> 3) Due to copyright issues, the mirror display function may not support the playback of protected videos such as Netflix via cellphone/Pad(Need Purchase TV Dongle) <br> <br> 4) Some Bluetooth speakers may have problems connecting to the projector due to Bluetooth protocol compatibility issues.