Mytobiidynavox devices: what is the difference between detach and deactivate?

On your Mytobiidynavox.com account web page there is a devices option.
This shows which devices and Apps are connected to your account.

Devices like T-Series or I-Series  that have Compass on them will have the detach option.

Compass Apps installed on Windows Computers, or tablets and iPads will have the Deactivate option