Anyone using CC2540?

Hi, I see that some Aliexpress sellers have both CC2531 and CC2540 sniffers for sale.

I haven’t seen CC2540 mentiones on this forum, so this confused me. Is anyone using CC2540? Should I stick with buying and using CC2531 only?

Ok, I just found out that CC2540 is bluetooth dongle and not zigbee.
I’m not sure why sellers group these two devices, they should be listed separately to avoid confusion.