Amcrest user manuals or other documentation does not show which cameras have external audio inputs.
I understand that some Amcrest IP cameras have a connector on the inside with a connection for an external speaker and microphone. Shockingly, the Amcrest documentation never shows connections that are the inside of the camera. Some of their IP cameras have a green connector on the inside where you can connect an external speaker or microphone. I can't find any way to determine which cameras have these other than to buy them, look inside, and then return the ones for refund that don't have the connector.
Looking for a low cost camera (less than $300), Wi-Fi ideally, but I can also use an IP camera. The IP3M-941 Wi-Fi worked perfectly for us, but it has been discontinued.