... adjustable for each channel, including contrast, lightness, hue and saturation.MPEG4 compression format, greatly reduce HDD usagePowerful video ... back, pause, stop, fast-forward, single-frame play and image capture.Support advanced search mode. Users can search by ... /XP/VistaMicrosoft DirectX 9.0 or aboveOne available USB 2.0 portPacking contents: 4 channel USB2.0 DVR,USB DVR,DVR,Cheap DVR-EzCAP3104