private const string deviceSelectWmiQuery = @"SELECT * FROM Win32_PnPEntity where DeviceID Like 'USB%' AND Name Like '%Apple Mobile Device USB%'";
private const string deviceOperationWmiQuery = @"SELECT * FROM __InstanceOperationEvent WITHIN 3 WHERE TargetInstance ISA 'Win32_PnPEntity' AND TargetInstance.Name Like '%Apple Mobile Device USB%'"; // Win32_USBHub
private ManagementEventWatcher usbDeviceWatcher;
//...
var usbDeviceOperationQuery = new WqlEventQuery(deviceOperationWmiQuery);
var scope = new ManagementScope("root\\CIMV2");
usbDeviceWatcher = new ManagementEventWatcher(scope, usbDeviceOperationQuery);

public void WatchUsbDevices()
{
    if (pollingTimer.IsEnabled)
    {
        StopWatchingUsbDevices();
    }

    usbDeviceWatcher.EventArrived += UsbDeviceOperationEvent;
    usbDeviceWatcher.Start();

    pollingTimer.Start();
}

public void StopWatchingUsbDevices()
{
    usbDeviceWatcher.EventArrived -= UsbDeviceOperationEvent;
    usbDeviceWatcher?.Stop();

    pollingTimer?.Stop();
}

private void UsbDeviceOperationEvent(object sender, EventArrivedEventArgs e)
{
    var usbDeviceInstance = e.NewEvent["TargetInstance"] as ManagementBaseObject;
    if (usbDeviceInstance != null)
    {
        if (e.NewEvent.ClassPath.ClassName.Equals("__InstanceCreationEvent"))
        {
            UsbDeviceInsertedEvent(sender, usbDeviceInstance);
        }
        else if(e.NewEvent.ClassPath.ClassName.Equals("__InstanceDeletionEvent"))
        {
            UsbDeviceRemovedEvent(sender, usbDeviceInstance);
        }
    }
}

private void UsbDeviceInsertedEvent(object sender, ManagementBaseObject usbDeviceInstance)
{
    var deviceID = (usbDeviceInstance.GetPropertyValue("DeviceID") as string)?.ToLower();
    // targetObject.Dispatcher.Invoke(() => { targetDevices.Add(device); });
}

private void UsbDeviceRemovedEvent(object sender, ManagementBaseObject instance)
{
    var deviceID = (instance.GetPropertyValue("DeviceID") as string)?.ToLower();
    // targetObject.Dispatcher.Invoke(() => targetDevices.Remove(deviceToRemove.First()));
}