... ,12mm, 16mm AudioProcessorG.726 audio compression format,build-in two way audio processor,support two way Talkback.Two ... NET4.5 or above Special Function Safety SettingsSupports the three-level password: administrator authority, user authorityautomatic recoveryabnormity,automatic recovery ... 9,16,25,36 or 64 multiple video display optional in one screen, support record, alarm, remote playback on records ...