diff --git a/.gitignore b/.gitignore
index 9b0ded5..28047b2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -53,3 +53,5 @@ node_modules
 ######################
 # Projects checked out to this root
 ######################
+
+\.vscode/
diff --git a/README.md b/README.md
index 3fc009b..5bb586b 100644
--- a/README.md
+++ b/README.md
@@ -296,6 +296,35 @@ virtualbox.guestproperty(function guestproperty_callback(machines, error) {
 });
 ```
 
+Obtaining an extra property by key name:
+
+```javascript
+var options = {
+  vm: "machine_name",
+  key: "GUI/Fullscreen"
+}
+
+virtualbox.extradata.get(options, function extradataget_callback(error, value) {
+  if (error) throw error;
+  console.log('Virtual Machine "%s" extra "%s" value is "%s"', options.vm, options.key, value);
+});
+```
+
+Writing an extra property by key name:
+
+```javascript
+var options = {
+  vm: "machine_name",
+  key: "GUI/Fullscreen",
+  value: "true"
+}
+
+virtualbox.extradata.set(options, function extradataset_callback(error) {
+  if (error) throw error;
+  console.log('Set Virtual Machine "%s" extra "%s" value to "%s"', options.vm, options.key, options.value);
+});
+```
+
 # Putting it all together
 
 ```javascript
@@ -346,6 +375,8 @@ virtualbox.start("machine_name", function start_callback(error) {
 - `.snapshotTake({vm:"machine_name"}, {vm:"snapshot_name"},  callback)`
 - `.snapshotDelete({vm:"machine_name"}, {vm:"snapshot_UUID"}, callback)`
 - `.snapshotRestore({vm:"machine_name"}, {vm:"snapshot_UUID"}, callback)`
+- `.extradata.get({vm:"machine_name", key:"keyname"}, callback)`
+- `.extradata.set({vm:"machine_name", key:"keyname", value:"val"}, callback)`
 
 # Troubleshooting
 
diff --git a/lib/virtualbox.js b/lib/virtualbox.js
index 8be964e..cbcd2c8 100644
--- a/lib/virtualbox.js
+++ b/lib/virtualbox.js
@@ -453,6 +453,38 @@ var guestproperty = {
 
 };
 
+var extradata =  {
+  get: function(options, callback) {
+    var vm = options.vm || options.name || options.vmname || options.title,
+      key = options.key,
+      value = options.defaultValue || options.value;
+
+    var cmd = 'getextradata "' + vm + '" "' + key + '"';
+    vboxmanage(cmd, function(error, stdout) {
+      if (error) {
+        callback(error);
+        return;
+      }
+      var value = stdout.substr(stdout.indexOf(':') + 1).trim();
+      if (value === 'No value set!') {
+        value = undefined;
+      }
+      callback(null, value);
+    });
+  },
+  
+  set: function(options, callback) {
+    var vm = options.vm || options.name || options.vmname || options.title,
+      key = options.key,
+      value = options.defaultValue || options.value;
+
+    var cmd = 'setextradata "' + vm + '" "' + key + '" "' + value + '"';
+    vboxmanage(cmd, function(error, stdout) {
+        callback(error);
+    });
+  }
+};
+
 module.exports = {
   'exec': vmExec,
   'kill': vmKill,
@@ -475,6 +507,7 @@ module.exports = {
   'snapshotDelete': snapshotDelete,
   'snapshotRestore': snapshotRestore,
   'isRunning': isRunning,
+  'extradata': extradata,
 
   'SCAN_CODES': require('./scan-codes')
 };
diff --git a/test/getextradata.js b/test/getextradata.js
new file mode 100644
index 0000000..f08c975
--- /dev/null
+++ b/test/getextradata.js
@@ -0,0 +1,12 @@
+"use strict";
+
+var virtualbox = require('../lib/virtualbox'),
+    args = process.argv.slice(2);
+
+virtualbox.extradata.get({vm: args[0], key: args[1]}, function(error, value){
+  if(error) {
+    throw error;
+  }
+
+  console.log('Virtual Machine "%s" extra "%s" value is "%s"', args[0], args[1], value);
+});
\ No newline at end of file
diff --git a/test/setextradata.js b/test/setextradata.js
new file mode 100644
index 0000000..3297707
--- /dev/null
+++ b/test/setextradata.js
@@ -0,0 +1,12 @@
+"use strict";
+
+var virtualbox = require('../lib/virtualbox'),
+    args = process.argv.slice(2);
+
+virtualbox.extradata.set({vm: args[0], key: args[1], value: args[2]}, function(error, value){
+  if(error) {
+    throw error;
+  }
+
+  console.log('Set Virtual Machine "%s" extra "%s" value to "%s"', args[0], args[1], args[2]);
+});
\ No newline at end of file