I don't want to say anything stupid, but it's always on. It tells you it's empty by email, on the registration address.

As far as I'm concerned, after activating the "Proximity radar" option, when you click on "RING", the tracker indicator flashes and a sound is emitted. But the sound is relatively weak as far as I'm concerned. I couldn't find a way to activate/deactivate or change the volume of the sound.

In the settings, the first item should be 'Proximity Radar', and entering this menu presents the option 'Start Playing'.