... Ω),support group circular monitoring AUDIOCompressionADPCMInput16 CH BNC (linear voltage,10.0KΩ)Output2 CH RCA (linear voltage,1.0KΩ)IntercomIndependent CH for intercom ... non-realtime D1Quality5 Levels (Basic,Medium,Good,High,Best)ModeManual, motion detection,Timing, Alarm trigger, Auto start, and so on.Video ...