How can you tell if a surveillance camera has audio?

Video technology makes it possible to use video surveillance not only for security and safety, but for all kinds of uses to cost-effectively monitor operations for business optimization and process improvement.

I wish this came with the Arlo cameras. Alas, it doesn't. I purchased one, and it actually makes the cameras mountable like a normal security camera. I put the 
4K Dome Security Camera, Starlight technology, 15fps at 4K, 2.8mm Lens, 110° View, 100ft IR night vision, True WDR, 3DNR, RCA Audio Input 
security cameras with audio. Great for outdoor or indoor use and can be mounted in-wall or ceiling. Created with audio built-in microphone and night vision.

Video Surveillance software enables new level of home security & surveillance.

Artificial intelligence is giving surveillance cameras digital brains to match their eyes, letting them analyze live video with no humans necessary. This could be good news for public safety, helping police and first responders more easily spot crimes and accidents and have a range of scientific and industrial applications. But it also raises serious questions about the future of privacy and poses novel risks to social justice.
Video Tutorial:
1) How to use video surveillance software?
2) How to add new video surveillance devices?
3) How to view video surveillance archive?
4) How to create Live broadcast from IP camera?
5) How to upload events to youtube automatically?
Video Surveillance Software
Video tutorial