Overview:1 Input: 1 X VGA;3 Loop-through Outputs: 1 X VGA, 1 X Composite Video, 1 X S-video;PC VGA resolution: 640X480 (60/72/75/85 Hz), 800X600 (60/75 Hz), 1024X768 (60/75 Hz). Higher resolutions are supported, while the lower the resolution is, the better the picture effect will be. On Screen Display (OSD); Plug & Play. No software driver is needed; Both PAL / NTSC are compatible; HSIZE, VSIZE, BRIGHTNESS, CONTRAST, HUE, SATURATION, SHARPNESS & OSD -BACKGROUND color are adjustable. It is powered by USB (Universal Serial Bus) port of PC host. When the USB (Universal Serial Bus) port of the PC host fails to function, a DC 5V external power supply is optional. Specification: Weight Approx:292g Size Approx:10 x 6 x 2.5