... DVD-RW ,network download Built-in web server, Support CMS, NAT traversal Support Mobile monitoring (3G), Iphone, Blackberry, Symbian Product ... accurate to second)Playback FunctionsPlay, Pause, Stop, Rewind, Fast play, Slow play, Next file, Previous file, Next camera, Previous camera, Full ... compression,4Channel D1+4Channel CIF real-time preview,support DVD-RM function