... 3Mbps, 8 levels of bit rate optionalAudioRecording modeStartup recording by default, support timing, alarm & event trigger, manual ... schedule, alarm & event trigger, manualsearchBy time, type, storage device, etc.Recording playbackSupport local playback, up to 4- ... 4X, 8X, 16X forward or backward, support playback by timeAlarmAlarm input4-channel alarm inputAlarm recordingPre-recording function, ...