UC30 High Quality LED Portable Projector with USB/MicroUSB/AV/SD/VGA/HDMI Inputs, 150 lumens brightness, 500:1 contrast ratio and 480*320 resolution. Optical keystone correction (Finel lens implantation mechanism to achieve graphic vertical trapezoidal distortion correction through optical and image system, this is the first time to use this function in low cost mini projector). Muiltiple optical coating bigger lens (it helps to be improved the higher lumens easily. The bigger size of lens help conformity to be better than other samll lens of projector).