... input1-4 channels input, 4 CVBS, 1.0Vp-p, 75ΩVideo output1CH output, CVBS, 1.0Vp-p, 75Ω,PreviewSupport 1 channel or ... InputMic or line in, up to 2 channelsAudio Output1 channel output, output voltage, 1V ~2VCompressionG.726, 5KB/sAlarmInputSupport up to 4 ... recording within 15 seconds ahead of the alarm startingOutput2Ch alarm output, level signal.Communication PortRS232 for remote control, RJ45 10M/ ...