D2004DH4-500G Step on the Internet:Support DEFEWAY cloud,no need to router mapping,just 1 step go to the Internet with DEFEWAY cloud technology. Compression algorithm ideal:H.264 High Profile. Playback quality:Support 4ch D1 realtime record,multiple channel realtime playback synchronous. Main and Sub Stream:Dual Stream, Main stream is for local record , sub stream is for network transmission. Mobile monitor:Support iPhone, Windows Mobile, BlackBerry, Symbian,Android mobile monitor