... 4ch H.264 Standalone DVR RecorderZS-3504HS ItemSpecificationsModel nameZS-3504HSVideo standardPAL/NSTC(optional)Compression formatH.264 ,(preview, recording, playback, backup, network ... rate5 Levels:120MB/H,150MB/H,250MB/H, 300MB/H,500MB/H, 1~1000MB/H Self-definedDisplay mode1/ ... IE browse, Real time Internet watch, Internet DVR PreferencesSet ,alarm triggered ,emailMobile monitorSupport Symbian, WinCE ...