1)PAL/NTSC are selectable 2)H.264 compression 3)4ch Video /4ch Audio Input 4)Support 2 PCS 1T SATA HDD ,Support 3G Mobile MODELSEDVR-7304AVVideo compressionH.264Audio compressionG711AVideo Input1.0Vp-p/75 Ohm, BNC connector x 4Video Output1.0Vp-p/75 Ohm, BNC connector x 1, VGA x 1Audio InputBNC connector x 4Audio OutputBNC connector x 1Alarm input2channelAlarm output1channelRecording ...