... (NTSC)Video InputComposite InputCVBS, 1.0Vp-p with 75Ω loadingAudio I/OCompressionG.726Audio InputMIC In or Line Input Unbalanced, 1.4Vp ... -p, 1VrmsAudio outputUnbalanced, 1.4Vp-p, 1VrmsAlarm I/OAlarm input1 External alarm inputAlarm output1 Relay outputNO 120VAC 1A ...