I-View EC-5MIPN 5-Megapixels Day/Night Box IP Camera - Manual (Page 22)

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2-3 Connecting to Audio Input / Output
Connect the audio in port of the camera with the microphone which provides 2Vp-p output level.
Connect the audio out port of the camera with the speaker which support amplify function.
Check the specifications for audio input and output.
Audio Codec: G.711,AAC 64kbps 8kHz sampling .
Audio in: Used for mono signal line input (Max.2.4 Vp-p)
Audio out: Used for mono signal line output (35mW) and impedance 600 Ohm.
2-4 Alarm I/O Wiring Diagram
Connecting to the I/O port box
Connect the Alarm I/O signal to the corresponding port of the rear port box.