use ngSwitch with on object with conditional attributes in Angular2

I am making an Angular2 application and am retrieving an array of devices from the server. Not every device has the attribute 'brand' or 'type'. I want to display either of them, but in case they both miss I want to display 'Device #'. I tried to use an ngSwitch, but can't seem to make it work...

<div *ngFor="let device of devices; let i=index">
<div [ngSwitch]="device">
<a *ngSwitchCase="device.brand">{{device.brand}}</a>
<a *ngSwitchCase="device.type">{{device.type}}</a>
<a *ngSwitchDefault>Device {{i+1}}</a>
</div>
</div>

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