angularjs - $observe an object attribute of a directive -

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There is a separate scope of my instruction and it receives an object from an attached controller as an attachment. 

  App Directional ('Description', function () {return {restricted: 'e', ​​radius: {device: '= device', ...}, templateUrl: '/ details .html ', link: function scope, element, attrs) {attrs. $ Inspection ('device', function (value) {...});}};});

and in HTML: 

  & lt; Details Tool = 'ctrlAlias.device' ... & gt;

I have read somewhere that if I want to check the change in the attribute, then I have to use the $ Inspection function. However, in most instances, I had only seen the use of $ inspection on primitive values ​​

I wonder if I can convert $ to device < How to show a property of / code>, device.exist (a boolean) and < attrs. Use device.id (a string) in $ ?

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