DVR 4CH, H.264 compression, support SATA HardDisk, Mouse, with VGA, USB, network, RS485 PTZ ... HardDisk, USB*NTSC:30FPS PAL:25FPS*4ch separate video display and compression, video simultaneouslyNO Audio*Recording bitstream/frame unadjustable;NO R485Language: 16 ... ,alarm,email,snapshot & FTPAudioAudio CompressionG711ABidrectional TalkSupport 4CH DVR H.264 compression, dvr recorder support SATA