... Control keypad. ,Improve the Reliability of the system also convenient for Installation and maintenance. Nice design , flexible, and fast operating ... GPS, G sensor, Gyro sensor optional. . Built-in wireless module like 3G (EVDO, HSPA, HSDPA, TD-SCDMA^), GPRS, WiFi ... . . 4CH alarm input/ 2CH alarm output. . RS232 interface for remote control; RJ45 10M/100M Ethernet port. . Video recording mode ...