1.Run the audio output cable to the rear of the recorder from the speaker. Connect RCA to the port mark as "A-OUT".
IMPORTANT: The speaker requires built-in amplifier which need external power source. Otherwise, the voice will be very small.
2.Click the speaker icon on the channel, you can start receiving the audio from the ip camera.
IMPORTANT: Make sure the ip camera supports audio input and has attached qualified microphone pick-up.
NOTE: The NVRs can receive the audio from the IP camera, but not talk to the IP camera. Only PC software or mobile phone APP can talk to the IP camera.