diff --git a/equipment/turtle_device.py b/equipment/turtle_device.py
deleted file mode 100644
index 3ba251f..0000000
--- a/equipment/turtle_device.py
+++ /dev/null
@@ -1,8 +0,0 @@
-from turtle import Turtle
-from controls.device import SynchronyDevice
-
-class TurtleDevice(SynchronyDevice):
-    pass  # TODO(Homework #3)
-
-
-
diff --git a/controls/.gitignore b/turtle/controls/.gitignore
similarity index 100%
rename from controls/.gitignore
rename to turtle/controls/.gitignore
diff --git a/controls/__init__.py b/turtle/controls/__init__.py
similarity index 100%
rename from controls/__init__.py
rename to turtle/controls/__init__.py
diff --git a/controls/device.py b/turtle/controls/device.py
similarity index 86%
rename from controls/device.py
rename to turtle/controls/device.py
index d126692..6d1b6ea 100644
--- a/controls/device.py
+++ b/turtle/controls/device.py
@@ -1,12 +1,16 @@
 from dataclasses import dataclass
 from typing import Optional, Collection, Any
-from abc import abstractmethod
-
-class DeviceLifecycleState:
-    pass  # TODO(Homework #3)
+from abc import ABC, abstractmethod, abstractproperty
+from enum import Enum
 
 
-class DevaceError(Exception):
+class DeviceLifecycleState(Enum):
+    INIT = 0
+    OPEN = 1
+    CLOSE = 2
+
+
+class DeviceError(Exception):
     pass
 
 
@@ -33,8 +37,7 @@ class ActionDescriptor:
     info: Optional[str] = None
 
 
-class Device:
-    # TODO(Homework #3)
+class Device(ABC):
     _state = DeviceLifecycleState.INIT
 
     @property
@@ -44,9 +47,11 @@ class Device:
     def close(self):
         self._state = DeviceLifecycleState.CLOSE
 
+    @abstractproperty
     def trait_descriptors(self) -> Collection[TraitDescriptor]:
         pass
 
+    @abstractproperty
     def action_descriptors(self) -> Collection[ActionDescriptor]:
         pass
 
@@ -79,4 +84,4 @@ class SynchronyDevice(Device):
     @abstractmethod
     def invalidate(self, trait_name: str):
         """Invalidate logical state of trait `trait_name`"""
-        pass
\ No newline at end of file
+        pass
diff --git a/equipment/__init__.py b/turtle/equipment/__init__.py
similarity index 100%
rename from equipment/__init__.py
rename to turtle/equipment/__init__.py
diff --git a/turtle/equipment/turtle_device.py b/turtle/equipment/turtle_device.py
new file mode 100644
index 0000000..e7d1245
--- /dev/null
+++ b/turtle/equipment/turtle_device.py
@@ -0,0 +1,34 @@
+from turtle import Turtle
+from typing import Optional, Collection, Any
+from controls.device import SynchronyDevice
+from controls.device import TraitDescriptor
+from controls.device import ActionDescriptor
+
+
+class TurtleDevice(SynchronyDevice):
+    def open(self):
+        self.turtle = Turtle()
+        super().open()
+
+    def close(self):
+        self.turtle.clear()
+        super().close()
+
+    def trait_descriptors(self) -> Collection[TraitDescriptor]:
+        pass
+
+    def action_descriptors(self) -> Collection[ActionDescriptor]:
+        pass
+
+    def __getitem__(self, trait_name: str) -> Optional[Any]:
+        """Return logical state of trait `trait_name`."""
+        pass
+
+    def read(self, trait_name: str) -> Any:
+        raise NonReadableTrait
+
+    def write(self, trait_name: str, value: Any) -> bool:
+        self.turtle.write()
+
+    def invalidate(self, trait_name: str):
+        pass
\ No newline at end of file
diff --git a/tests/controls/test_device.py b/turtle/tests/controls/test_device.py
similarity index 100%
rename from tests/controls/test_device.py
rename to turtle/tests/controls/test_device.py
diff --git a/tests/equipment/test_turtle_device.py b/turtle/tests/equipment/test_turtle_device.py
similarity index 100%
rename from tests/equipment/test_turtle_device.py
rename to turtle/tests/equipment/test_turtle_device.py