Yes that is possible. Your smartphone can be connected to any number of ooono co-drivers (but only one at a time).
The first time you want to connect a new ooono co-driver to your smartphone, you just open the ooono connect appen and hold down the button on your ooono for 5-7 seconds and the new ooono co-driver will connect to your smartphone. After this the ooono co-driver device will automatically connect to your smartphone the next time you start to drive.
🔺 Important: When you are connecting a new ooono co-driver to your smartphone it's important that your existing ooono co-driver is not connected to your smartphone.
You can check this in the ooono connect app - it has to say "searching" and not "connected" before you can connect another ooono co-driver device to your smartphone.