... Channels ROM:Built-in voice alert files CCTV DVR 4CHH.264 Stand-alone DVR HRC-168-AF-DVR-II-A/4-4 E 4 ... compression / decompression, high-capacity hard disk records, TCP / IP network technology, code in the FLASH curing, the system running more stable ... compression / decompression, high-capacity hard disk records, TCP / IP network technology, code in the FLASH curing, the system running more stable ...