diff --git a/dom/system/gonk/Makefile.in b/dom/system/gonk/Makefile.in
index cc1946b3e2ee..ebba5bda38ac 100644
--- a/dom/system/gonk/Makefile.in
+++ b/dom/system/gonk/Makefile.in
@@ -42,6 +42,7 @@ XPIDLSRCS = \
   nsIVolumeService.idl \
   nsIVolumeStat.idl \
   nsIWorkerHolder.idl \
+  nsIAudioChannelManager.idl \
   $(NULL)
 
 LOCAL_INCLUDES = \
diff --git a/dom/system/gonk/nsIAudioChannelManager.idl b/dom/system/gonk/nsIAudioChannelManager.idl
new file mode 100644
index 000000000000..fe8ec1c041ef
--- /dev/null
+++ b/dom/system/gonk/nsIAudioChannelManager.idl
@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIDOMEventTarget.idl"
+
+[scriptable, builtinclass, uuid(06a6893d-1c0d-4ad7-93fd-bc479b44d55b)]
+interface nsIAudioChannelManager : nsIDOMEventTarget {
+  /**
+   * Indicates whether the headphones are plugged in or not.
+   */
+  readonly attribute boolean headphones;
+
+  /**
+   * Fired when the headphones are plugged or unplugged.
+   *
+   * When the headphones are unplugged, we may start playing audio through the
+   * system's speakers.  Similarly, when headphones are plugged in, we may
+   * switch audio from speakers to headphones.
+   *
+   * If audio is currently playing in this window or in one of its children, we
+   * will fire this event before we switch the audio output from headphones to
+   * speakers (or vice versa).  This allows you to, for example, pause your
+   * window's audio when the headphones are unplugged.
+   */
+  [implicit_jscontext] attribute jsval onheadphoneschange;
+};