diff --git a/compose_viz/models/service.py b/compose_viz/models/service.py
index abd94f6..4ba1bbe 100644
--- a/compose_viz/models/service.py
+++ b/compose_viz/models/service.py
@@ -1,5 +1,6 @@
 from typing import List, Optional
 
+from compose_viz.models.device import Device
 from compose_viz.models.extends import Extends
 from compose_viz.models.port import Port
 from compose_viz.models.volume import Volume
@@ -18,7 +19,7 @@ class Service:
         extends: Optional[Extends] = None,
         cgroup_parent: Optional[str] = None,
         container_name: Optional[str] = None,
-        devices: List[str] = [],
+        devices: Optional[Device] = None,
         env_file: List[str] = [],
         expose: List[str] = [],
         profiles: List[str] = [],
@@ -31,12 +32,12 @@ class Service:
         self._depends_on = depends_on
         self._links = links
         self._extends = extends
-        self.cgroup_parent = cgroup_parent
-        self.container_name = container_name
-        self.devices = devices
-        self.env_file = env_file
-        self.expose = expose
-        self.profiles = profiles
+        self._cgroup_parent = cgroup_parent
+        self._container_name = container_name
+        self._devices = devices
+        self._env_file = env_file
+        self._expose = expose
+        self._profiles = profiles
 
     @property
     def name(self):
@@ -69,3 +70,27 @@ class Service:
     @property
     def extends(self):
         return self._extends
+
+    @property
+    def cgroup_parent(self):
+        return self._cgroup_parent
+
+    @property
+    def container_name(self):
+        return self._container_name
+
+    @property
+    def devices(self):
+        return self._devices
+
+    @property
+    def env_file(self):
+        return self._env_file
+
+    @property
+    def expose(self):
+        return self._expose
+
+    @property
+    def profiles(self):
+        return self._profiles