Producing newest 4 channel hd dvr with high-quality,Website:://.brvision.org, Brvision Technology Co.,Ltd is one of the best such manufacturers and suppliers, welcome to buy discount 4 channel hd dvr from us.This equipment is designed for Mobile DVR, it is equipped with embedded processor and equippedwith embedded operating system, for example ,Audio and video compression/ decompression,Large-capacity data recording and TCP/IP technologies.Item No.BR-BMR404Operating systemEmbedded Linux Operating Systemvideo compressionH.264backup typeNetwork backup. USB backupWireless interfaceSupport 3G/GPS/GPRS/WIFIMemory MediaHDD ,SD cardnetwork interfaceRJ45 10M/100M Ethernet interfaceUSB interface4 USB 2.0 interface ; 1 USB 1.1 interfacepowerDC 6~36V Input, DC 5V/2A 12V/2A output