Ember checkboxes are connected

I have a table of data. You can checkmark the rows you want to save. The problem I have is that all the checkboxes are connected. So if you check one, it checks them all and if you uncheck one then they all uncheck. Some of them come pre-checked and I'm passing in the isChecked value to indicate that. How do I make each one unique?

Template:

{{#each item in pagedContent}}
        <tr>
            <td class="center">{{input type="checkbox" checked=isChecked name=item.itemId}}</td>
            <td class="center">{{item.itemId}}</td>
            <td class="">{{item.description}}</td>
        </tr>
{{/each}}

Controller

import Ember from 'ember';
import pageableTable from 'web-app-admin/mixins/pageable-table';

export default Ember.ArrayController.extend(pageableTable, {
  isChecked: true,
  allChecked: true,
  allCheckedToggle: function(){
      if(this.get('allChecked') === false){
        this.set('isChecked', false);
      }
      else{
        this.set('isChecked', true);
      }
  }.observes('allChecked')
});