diff --git a/pybricks/ev3devices.py b/pybricks/ev3devices.py
new file mode 100644
index 0000000..455c4a9
--- /dev/null
+++ b/pybricks/ev3devices.py
@@ -0,0 +1,53 @@
+"""EV3 motors and sensors."""
+
+from parameters import Stop, Direction
+
+
+class Motor():
+    """Medium or Large EV3 motor."""
+
+    def __init__(self, port, direction=Direction.clockwise, gears=None):
+        """Motor(port, direction=Direction.clockwise, gears=None)
+
+        Arguments:
+            port (Port): Port to which the motor is connected
+            direction (Direction): Positive speed direction. (*Default*: Direction.clockwise)
+            gears (list): List of the number of teeth on each gear in a gear train, as shown in the examples below. Use a list of lists for multiple gear trains. (*Default*: None)
+        ::
+
+            Example for one gear train: gears=[12, 36]
+             ____________
+            |            |
+            |    motor   |
+            |____________|
+                  ||
+                  || 12t      36t
+                ||||||  ||||||||||||||
+                              ||
+                              ||
+                          output axle
+
+
+            Example with multiple gear trains: gears=[[12, 20, 36], [20, 40], [20, 8, 40]]
+            _____________
+            |            |
+            |    motor   |
+            |____________|
+                  ||
+                  || 12t    20t           36t
+                ||||||  |||||||||||  ||||||||||||||
+                                           ||
+                                           ||
+                                        ||||||||  |||||||||||||||||
+                                            20t          || 40t
+                                                         ||
+                                                      ||||||||  |||  |||||||||||||||||
+                                                          20t    8t         || 40t
+                                                                            ||
+                                                                        output axle
+        """
+        pass
+
+    def run_time(self, speed):
+        """Test docstring."""
+        pass
diff --git a/pybricks/parameters.py b/pybricks/parameters.py
index 7046cad..6e13d1b 100644
--- a/pybricks/parameters.py
+++ b/pybricks/parameters.py
@@ -110,26 +110,6 @@ class Direction():
     counterclockwise = -1
 
 
-class Completion(Enum):
-    """How the motor action should complete: foreground or background.
-
-    Note: A motor can only do one thing at the time. If a motor is running in
-    the background and you give it a new command, only the new command applies.    
-
-    +-----------------------+-------------------------------------------------------------------+
-    | Parameter             | Effect                                                            |
-    +=======================+===================================================================+
-    | Completion.foreground | Your script waits for the motor action to complete.               |
-    +-----------------------+-------------------------------------------------------------------+
-    | Completion.background | Your script continues immediately while the motor is still moving.|
-    +-----------------------+-------------------------------------------------------------------+
-
-    """
-
-    foreground = 0
-    background = 1
-
-
 class Button(Enum):
     """Buttons on a brick or remote: