Wireless, Battery-Operated Camera Suggestions?

I used the search function first, in case this was something that comes up all the time. Forgive me if this is the 90th time the question has been asked. I didn't see anything since 2013 with the search function.

system- Ocularis

Need a wireless/battery operated camera (like a go-pro type camera) that a security guard or operations person could pull out of a drawer and walk around with it, while being remotely viewed by an engineer through our camera system.

I can handle the network part of this, but I'm at a deadend for hardware. Everything I'm seeing is retail level that requires an app or subscription streaming service, etc, that would then have to be installed on every engineer's device, just a nightmare.

Another problem I have is that when I DO find an Ocularis compatible wireless camera, it turns out to not really be wireless... still needs AC adapter.

Any suggestions?

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