diff --git a/libnymea/interfaces/blind.json b/libnymea/interfaces/blind.json
new file mode 100644
index 00000000..79b21a7c
--- /dev/null
+++ b/libnymea/interfaces/blind.json
@@ -0,0 +1,3 @@
+{
+    "extends": "simpleclosable"
+}
diff --git a/libnymea/interfaces/closable.json b/libnymea/interfaces/closable.json
index 71e89f4c..04e5aca1 100644
--- a/libnymea/interfaces/closable.json
+++ b/libnymea/interfaces/closable.json
@@ -2,7 +2,7 @@
     "states": [
         {
             "name": "state",
-            "type": "String",
+            "type": "QString",
             "allowedValues": ["open", "closed", "opening", "closing"]
         }
     ],
diff --git a/libnymea/interfaces/interfaces.qrc b/libnymea/interfaces/interfaces.qrc
index c2f3a390..4ff9bbf8 100644
--- a/libnymea/interfaces/interfaces.qrc
+++ b/libnymea/interfaces/interfaces.qrc
@@ -30,6 +30,8 @@
         <file>closable.json</file>
         <file>door.json</file>
         <file>shutter.json</file>
+        <file>simpleclosable.json</file>
+        <file>blind.json</file>
     </qresource>
     <qresource prefix="/"/>
 </RCC>
diff --git a/libnymea/interfaces/shutter.json b/libnymea/interfaces/shutter.json
index 18140ee9..79b21a7c 100644
--- a/libnymea/interfaces/shutter.json
+++ b/libnymea/interfaces/shutter.json
@@ -1,3 +1,3 @@
 {
-    "extends": "closable"
+    "extends": "simpleclosable"
 }
diff --git a/libnymea/interfaces/simpleclosable.json b/libnymea/interfaces/simpleclosable.json
new file mode 100644
index 00000000..4a9c6b91
--- /dev/null
+++ b/libnymea/interfaces/simpleclosable.json
@@ -0,0 +1,13 @@
+{
+    "actions": [
+        {
+            "name": "open"
+        },
+        {
+            "name": "close"
+        },
+        {
+            "name": "stop"
+        }
+    ]
+}