Yes, Atmotube PRO 2 can be paired with multiple smartphones - one at a time.
Atmotube PRO 2 can maintain a Bluetooth connection with only one device simultaneously. You can switch between smartphones, but keep the following in mind:
When Atmotube PRO 2 is connected to one smartphone, it becomes invisible to other devices.
If several smartphones with the Atmotube app installed are nearby, disable Bluetooth on the ones you’re not currently using to avoid connection conflicts.
The device’s data history is synced automatically once, but the Atmotube PRO 2 keeps the history until its local storage is full.
To sync all history data manually, open the app and go to:
App → Settings → Data → Sync all history data