getting information from a polling WiFi device

I watched a little video where someone talked about the information that can be gained from a device polling for a WiFi connection such as a phone with WiFi left turned on. I can't find how to get this information. Is there a tool in Kali that can get this out of a polling device or can someone point me in the right direction? All I can find is how to crack WiFi passwords

Thanks
Adam

Network sniffers like Wireshark attached to your promiscuous WiFi card will get you started.

Thanks, will it be obvious what to look for?

Check out beacon frames and probe request/response frames.