diff --git a/core/input.py b/core/input.py
index 18042e8..cc450c7 100644
--- a/core/input.py
+++ b/core/input.py
@@ -22,22 +22,19 @@ callbacks = {}
 class Object(object):
     def __init__(self):
         super(Object, self).__init__()
-        self._id = str(uuid.uuid4())
-
-    def id(self):
-        return self._id
+        self.id = str(uuid.uuid4())
 
 def register(obj, button=None, cmd=None):
-    logging.debug('registering callback {} {}'.format(obj.id(), button))
-    callbacks.setdefault(obj.id(), {}).setdefault(button, []).append(cmd)
+    logging.debug('registering callback {} {}'.format(obj.id, button))
+    callbacks.setdefault(obj.id, {}).setdefault(button, []).append(cmd)
 
 def trigger(event):
     for field in ['instance', 'name']:
         if field in event:
             cb = callbacks.get(event[field])
-            _invoke(event, cb)
+            __invoke(event, cb)
 
-def _invoke(event, callback):
+def __invoke(event, callback):
     if not callback: return
     if not 'button' in event: return
 
diff --git a/core/output.py b/core/output.py
index 6e84cc1..f93f7c1 100644
--- a/core/output.py
+++ b/core/output.py
@@ -65,8 +65,8 @@ class i3(object):
             'border_left': self._theme.border_left(),
             'border_right': self._theme.border_right(),
             'border_bottom': self._theme.border_bottom(),
-            'instance': widget.id(),
-            'name': module.id(),
+            'instance': widget.id,
+            'name': module.id,
         }
 
     def __separator(self, module, widget):
@@ -109,7 +109,7 @@ class i3(object):
     def update(self, affected_modules=None):
         now = time.time()
         for module in self._modules:
-            if affected_modules and not module.id() in affected_modules:
+            if affected_modules and not module.id in affected_modules:
                 continue
             if not affected_modules and module.next_update:
                 if now < module.next_update:
diff --git a/doc/NOTES.md b/doc/NOTES.md
index fc32cff..4440fe5 100644
--- a/doc/NOTES.md
+++ b/doc/NOTES.md
@@ -34,3 +34,4 @@
 - theme: `load` vs. `__load` vs. `load_keywords`
 - themes: use colors to improve theme readability
 - brightness: read from CLI tools
+- input: use events?
diff --git a/tests/core/test_input.py b/tests/core/test_input.py
index c9f2ff8..e469543 100644
--- a/tests/core/test_input.py
+++ b/tests/core/test_input.py
@@ -6,8 +6,8 @@ class config(unittest.TestCase):
     def setUp(self):
         self.inputObject = core.input.Object()
         self.anotherObject = core.input.Object()
-        self.someEvent = { 'button': core.input.LEFT_MOUSE, 'instance': self.inputObject.id() }
-        self.anotherEvent = { 'button': core.input.RIGHT_MOUSE, 'instance': self.inputObject.id() }
+        self.someEvent = { 'button': core.input.LEFT_MOUSE, 'instance': self.inputObject.id }
+        self.anotherEvent = { 'button': core.input.RIGHT_MOUSE, 'instance': self.inputObject.id}
         self.callback = unittest.mock.MagicMock()
         self.callback2 = unittest.mock.MagicMock()
         self.someCommand = 'some sample command'