surveillance cameras with audio

How can you tell if a surveillance camera has audio? Do surveillance cameras have sound? What is 2 way audio camera?

Video surveillance systems involve strategic placement of security cameras, monitoring motion and activity, generating alerts, transmitting footage, and storing that footage. Cameras can be both indoors and outside.

Lorex Audio Security Cameras
1080p HD Surveillance DVR System with 4K Ultra HD DVR and 8 ...

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surveillance cameras with audio
Lorex Audio Security Cameras


Home Surveillance
best home security camera system with audio - Best Buy

I have been looking for an easy to set up inexpensive way to have a security camera set for my home. After looking for about 7 months I chose these cameras.