diff --git a/index.html b/index.html
index 4706abc..6c0703a 100644
--- a/index.html
+++ b/index.html
@@ -9,18 +9,31 @@
     <div id="info">
       <p class="instructions">Twilio Client</p>
       <div id="client-name"></div>
+      <div id="output-selection">
+        <label>Ringtone Devices</label>
+        <select id="ringtone-devices" multiple></select>
+        <label>Speaker Devices</label>
+        <select id="speaker-devices" multiple></select><br/>
+        <a id="get-devices">Seeing unknown devices?</a>
+      </div>
     </div>
     <div id="call-controls">
       <p class="instructions">Make a Call:</p>
       <input id="phone-number" type="text" placeholder="Enter a phone # or client name" />
       <button id="button-call">Call</button>
       <button id="button-hangup">Hangup</button>
+      <div id="volume-indicators">
+        <label>Mic Volume</label>
+        <div id="input-volume"></div><br/><br/>
+        <label>Speaker Volume</label>
+        <div id="output-volume"></div>
+      </div>
     </div>
     <div id="log"></div>
   </div>
 
-  <script type="text/javascript" src="//media.twiliocdn.com/sdk/js/client/v1.3/twilio.min.js"></script>
+  <script type="text/javascript" src="//media.twiliocdn.com/sdk/js/client/v1.4/twilio.min.js"></script>
   <script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
   <script src="quickstart.js"></script>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/quickstart.js b/quickstart.js
index 056cd79..828b92a 100644
--- a/quickstart.js
+++ b/quickstart.js
@@ -1,4 +1,10 @@
 $(function () {
+  var speakerDevices = document.getElementById('speaker-devices');
+  var ringtoneDevices = document.getElementById('ringtone-devices');
+  var outputVolumeBar = document.getElementById('output-volume');
+  var inputVolumeBar = document.getElementById('input-volume');
+  var volumeIndicators = document.getElementById('volume-indicators');
+
   log('Requesting Capability Token...');
   $.getJSON('/token.php')
     .done(function (data) {
@@ -21,12 +27,15 @@
         log('Successfully established call!');
         document.getElementById('button-call').style.display = 'none';
         document.getElementById('button-hangup').style.display = 'inline';
+        volumeIndicators.style.display = 'block';
+        bindVolumeIndicators(conn);
       });
 
       Twilio.Device.disconnect(function (conn) {
         log('Call ended.');
         document.getElementById('button-call').style.display = 'inline';
         document.getElementById('button-hangup').style.display = 'none';
+        volumeIndicators.style.display = 'none';
       });
 
       Twilio.Device.incoming(function (conn) {
@@ -43,6 +52,13 @@
       });
 
       setClientNameUI(data.identity);
+
+      Twilio.Device.audio.on('deviceChange', updateAllDevices);
+
+      // Show audio selection UI if it is supported by the browser.
+      if (Twilio.Device.audio.isSelectionSupported) {
+        document.getElementById('output-selection').style.display = 'block';
+      }
     })
     .fail(function () {
       log('Could not get a token from server!');
@@ -65,8 +81,76 @@
     Twilio.Device.disconnectAll();
   };
 
+  document.getElementById('get-devices').onclick = function() {
+    navigator.mediaDevices.getUserMedia({ audio: true })
+      .then(updateAllDevices);
+  };
+
+  speakerDevices.addEventListener('change', function() {
+    var selectedDevices = [].slice.call(speakerDevices.children)
+      .filter(function(node) { return node.selected; })
+      .map(function(node) { return node.getAttribute('data-id'); });
+
+    Twilio.Device.audio.speakerDevices.set(selectedDevices);
+  });
+
+  ringtoneDevices.addEventListener('change', function() {
+    var selectedDevices = [].slice.call(ringtoneDevices.children)
+      .filter(function(node) { return node.selected; })
+      .map(function(node) { return node.getAttribute('data-id'); });
+
+    Twilio.Device.audio.ringtoneDevices.set(selectedDevices);
+  });
+
+  function bindVolumeIndicators(connection) {
+    connection.volume(function(inputVolume, outputVolume) {
+      var inputColor = 'red';
+      if (inputVolume < .50) {
+        inputColor = 'green';
+      } else if (inputVolume < .75) {
+        inputColor = 'yellow';
+      }
+
+      inputVolumeBar.style.width = Math.floor(inputVolume * 300) + 'px';
+      inputVolumeBar.style.background = inputColor;
+
+      var outputColor = 'red';
+      if (outputVolume < .50) {
+        outputColor = 'green';
+      } else if (outputVolume < .75) {
+        outputColor = 'yellow';
+      }
+
+      outputVolumeBar.style.width = Math.floor(outputVolume * 300) + 'px';
+      outputVolumeBar.style.background = outputColor;
+    });
+  }
+
+  function updateAllDevices() {
+    updateDevices(speakerDevices, Twilio.Device.audio.speakerDevices.get());
+    updateDevices(ringtoneDevices, Twilio.Device.audio.ringtoneDevices.get());
+  }
 });
 
+// Update the available ringtone and speaker devices
+function updateDevices(selectEl, selectedDevices) {
+  selectEl.innerHTML = '';
+  Twilio.Device.audio.availableOutputDevices.forEach(function(device, id) {
+    var isActive = (selectedDevices.size === 0 && id === 'default');
+    selectedDevices.forEach(function(device) {
+      if (device.deviceId === id) { isActive = true; }
+    });
+
+    var option = document.createElement('option');
+    option.label = device.label;
+    option.setAttribute('data-id', id);
+    if (isActive) {
+      option.setAttribute('selected', 'selected');
+    }
+    selectEl.appendChild(option);
+  });
+}
+
 // Activity log
 function log(message) {
   var logDiv = document.getElementById('log');
@@ -79,4 +163,4 @@ function setClientNameUI(clientName) {
   var div = document.getElementById('client-name');
   div.innerHTML = 'Your client name: <strong>' + clientName +
     '</strong>';
-}
\ No newline at end of file
+}
diff --git a/site.css b/site.css
index 77eb8b0..66c6f31 100644
--- a/site.css
+++ b/site.css
@@ -10,6 +10,14 @@ body {
   background: #272726;
 }
 
+label {
+  text-align: left;
+  font-family: Helvetica, sans-serif;
+  font-size: 1.25em;
+  color: #777776;
+  display: block;
+}
+
 div#controls {
   padding: 3em;
   max-width: 1200px;
@@ -26,6 +34,40 @@ div#controls {
       margin: 0 1.5em;
       text-align: center;
     }
+      div#controls div#info div#output-selection {
+        display: none;
+      }
+
+      div#controls div#info a {
+        font-size: 1.1em;
+        color: khaki;
+        text-decoration: underline;
+        cursor: pointer;
+      }
+
+      div#controls div#info select {
+        width: 300px;
+        height: 60px;
+        margin-bottom: 2em;
+      }
+
+      div#controls div#info label {
+        width: 300px;
+      }
+
+      div#controls div#call-controls div#volume-indicators {
+        display: none;
+        padding: 10px;
+        margin-top: 20px;
+        width: 500px;
+        text-align: left;
+      }
+
+        div#controls div#call-controls div#volume-indicators > div {
+          display: block;
+          height: 20px;
+          width: 0;
+        }
 
   div#controls p.instructions {
     text-align: left;