... , CMS(DSS/PSS) & DMSS> Built-in 5.6 inch screen(-UD only) ModelDVR0404AL-UDVR0404AL-UDSystemMain ProcessorEmbedded processorOperating SystemEmbedded LINUXVideoInput4 channel, BNCStandardNTSC ... , DHCP, DNS, IP Filter, PPPOE, DDNS, FTP, Email, Alarm ServerMax. User Access20 usersSmart PhoneiPhone, iPad, Android, Windows PhoneStorageInternal HDD4 SATA portsExternal ...