... Alarm, RS485, RS232, 1U SMART CASE Full D1 Realtime Dahua DVR recorderSpecifications1)4ch ... embedded microprocessorOperating SystemEmbedded LINUXSystem ResourcesPentaplex function: live, recording, playback, backup & remote accessControl ModeFront panel ... , VBR effectively)Recording ModeManual, Schedule(Regular(Continuous), MD(Video detection: Motion detection, Camera blank, Video loss), Alarm), ...