... 4 channel wireless 3G bus DVR 1.H.264 format 2.1~4CH video input 3.3G and GPS are available 4 ... .CIF,HD1,D1 resolution 1~4 channel wireless 3G bus DVRIntroduction1,Support 4CH video ... data in the video.3,Built-in GPS,3G wireless communication module,which achieve global positioning and real- ... in Shenzhen Security&protection Industry Association 1~4 channel wireless 3G bus DVR