In short, the answer is yes, CCTV camera systems are designed to record audio in conjunction with images. However, whether or not an employer or a retail location is allowed to record audio is another matter entirely.
How do I know if my CCTV has a mic?
If you want to tell if a security camera has audio, one of the easiest ways about it is to look around it. Though usually small, the microphone in a camera is generally very easy to spot. It should be around the camera's housing and is most likely a small black dot that is used for picking up sounds.
Is CCTV with audio legal?
CCTV audio recording laws state that conversations between members of the public are not allowed to be recorded. The only exceptions to this rule include panic buttons in a taxi or monitoring carried out in a private area of a police custody room.