H.264 main profile compression 100/120fps recording for 960H 4 channel playback simultaneously support 3G and wifi 3G DV 4-Channel Industry-Grade HD DVR 3G Features audio/video compression technology;. 4-channel audio/video input;.ASF standard file format;.3G, GPS, Wi-Fi modules optional,.Local and remote PTZ control,. Data redundant storage technology,. Live Vehicle Location Tracking / Routine ...