I have a bunch of Nest Detect (A0028) sensors from the now defunct Google Nest home security system.

Anybody know what radio protocol these things use? Zigbee? Z-Wave? some other thing?

I have a Z-Wave USB dongle, or I could get a Zigbee one, but I’m not sure if either of them actually communicates with these devices.

I hate to throw them away, as they’re well designed.