In case your car is stolen by someone with an iPhone, the thief could be notified of the presence of the tracker, similar to an AirTag.
This is often seen as an advantage by customers, as the notification deters the thief before they even try to break into or tamper with your vehicle. The thief could recognize from the warning that the car is being monitored and thus be deterred from taking further steps.
The tracker itself is discreet and looks like an ordinary charger, so it can only be detected as a tracker upon close inspection. A simple trick: you can cover the label of the device or make it unrecognizable with a marker to make it even more inconspicuous.