If you have any doubts whether your Drive One device is connected to your Drive One app, you have the option of turning on the Connection Indicator.
With this you can make the Drive One device blink and/or make a discreet sound, at regular intervals, indicating that there is a connection.
In the Drive One app, you can turn this feature on or off.
Go to Menu - > Device Settings - Connection Indicator
If you want a flash and/or a sound, you can decide how often it should flash or beep
The green flash can be set to every 15 seconds up to every 300 seconds.
The beep can be set to be played from 1 up to every 5 minutes
You can turn these warnings off completely, so you don't get any flashes or sounds.