Compact 4 Camera GPRS mobile dvr camera With H.264 Compression 3G and GPS 1) 4CH, Support 4 cameras2)H.264 compression format3))64GB SD Card4) 2.5“ SATA Hard disk 5)GPS tracking&locating6)3G realtime remote control7) Built-in WIFI for option8)6 alarm input, 1 alarm output9)talkback 10)RS232/485 interface