Full disclosure; in 2023 Plume closed further sale of these devices so they are now really quite collectable and hard to find.   However to clarify,  their services and server backend all still work and the apps for mobile are still available.   

These two devices are "sold as seen" because I am not using them.   I believe they work fine but I can't prove this so they may not and be useful just for parts.    

I have deleted my plume account so in theory these devices are not connected to me any more and can be registered with a new user account.

Visually they are in mint condition because they were never actually used in the street or attached to bags as intended.  They were basically used as indoor sensors so have had a very easy life.

The sensors are really well made and these version 2 "Flow 2" sensors are easier to operate and have numerous design tweaks over the original "Flow" device.