The notio alone is around 950€.
i think with data logger it’s a inbuilt ant+ computer, but without screen. since they use srm, probably the modified srm protocol.
Quarq had something like that, it was able to capture more data packages in a second and was installed behind the seatpost.
Also the FES powermeter works likes this, captures torque and rpm a couple times a second, data needs to be downloaded after the ride.
I should be able to catch a close look at the Argon 18 tomorrow.