checkbox-toggle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  model: null,
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  model: Ember.Object.create({'foobar': false})
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
{{my-component model=model}}

templates.components.my-component.hbs

model.foobar: {{model.foobar}}:
<input type="checkbox"
       id="sendEmail"
       checked="{{if model.foobar 'checked'}}" 
       onclick={{action (mut model.foobar) value="target.checked"}}
/>

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}