2 in 1 DVR / NVR 4 Channel w/ 16gb USB Flash Drive 3G moible phone accessible (Hard Drive NOT included) 2 way Convertable between 4 Channel Analog camera DVR to NVR with one Channel IP camera (720P) and 3 Channel Anolagy camera Free 16GB USB Flash for video clips backup H.264 compression algorithm ideal for standalone DVR, Realtime live display up to 4 cameras Support 3G mobile surveillance and E-mail Function, Graphical Interface Smart HDDs Management; Maximum capacity of SATA HDD supports 2TB (not included)