... 2 CH Audio intput 3G Real time 4ch H.264 Standalone DVR RecorderZS-3504HS ItemSpecificationsModel nameZS-3504HSVideo standardPAL/NSTC(optional)Compression formatH ... /PPPOENetwork function· Support IE browse, Real time Internet watch, Internet DVR PreferencesSet ,alarm triggered ,emailMobile monitorSupport Symbian, WinCE, I phone, ... Disk)Packed weight2.6KGDevice dimension320×270×55mm (L*W*H) 1U chassis