4CH security DVR 1CH audio dvr real time system DDNS RS 485 Control mobile phone view Support 1 SATA port HDD MAX 2000GB 4CH security DVR, 4-CH DVR, cctv dvr4CH video and 1CH Audio real time Recording and display4CH D1Video I/O: 4/1Playback: 4RS485: supportAudio I/O: 1/1 4/1Alarm: N/AHDD: 1*2T ModelHSD7504VHSD7504AVSystemMain ProcessorHigh performance embedded microprocessor HI3515Operating ...
