... 3Contrast Ratio300:1Definition>300LBrightness>300cd/m²Video input1VP-P 75Ω THREE WAY(optional) Video SystemPALAccessories(optional)Input portRCA input ... WDescription:1, Three-way video input, can be key to switch 2, Button can be used to adjust the brightness, contrast3, ... model4, Use keys to switch the signal source, select the VCD video, rearview camera door video or surveillance video.5, Wide power ...