<p> <b> Update brightness </b></p> <p> The F405 projector used a 6-layer glass lens with high light transmission, the brightness was increased by 80% and the light transmission by 30%. The upgrade projector can meet most types of home entertainment customer needs. </p> <p> <b> Improved Color Contrast Ratio </b> </p> <p> The Full HD projector improved the color contrast to 8000 : 1 to restore the true color of the projection display and to present the vivid video images to our customers. </p> <p> <b> Stable LED light source </b> </p> <p> The video projector used the advanced LED Light source that is stable, low-flicker and protects your eyes. In this case, you will not feel tired even when you watch long time,it's also designed to prevent overheating and noise to ensure that the temperature of the projector is within safe limits (NOTE: To extend the service life, the projector should take a break after 4-5 hours of continuous use). <br> <br> <b > Important note: </b> <br> <br> 1) All home cinema projectors are mainly used home entertainment, not business presentations. F405 work optimally in a dark environment and the edges of the screen are slightly less sharp than in the center.<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 (Need Purchase TV stick ) <br> <br> 4) Some Bluetooth speakers may have problems connecting to the projector due to Bluetooth protocol compatibility issues.