diff --git a/inventory/models/device_type.py b/inventory/models/device_type.py
new file mode 100644
index 0000000..5611821
--- /dev/null
+++ b/inventory/models/device_type.py
@@ -0,0 +1,16 @@
+from typing import List, Optional
+
+from sqlalchemy import Unicode
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from crudkit.core.base import Base, CRUDMixin
+
+class DeviceType(Base, CRUDMixin):
+    __tablename__ = 'item'
+
+    description: Mapped[Optional[str]] = mapped_column(Unicode(255), nullable=True)
+
+    inventory: Mapped[List['Inventory']] = relationship('Inventory', back_populates='device_type')
+
+    def __repr__(self):
+        return f"<Item(id={self.id}, description={repr(self.description)})>"
diff --git a/inventory/models/room.py b/inventory/models/room.py
new file mode 100644
index 0000000..9997d37
--- /dev/null
+++ b/inventory/models/room.py
@@ -0,0 +1,4 @@
+from crudkit.core.base import Base, CRUDMixin
+
+class Room(Base, CRUDMixin):
+    __tablename__ = 'rooms'
\ No newline at end of file
diff --git a/inventory/models/room_function.py b/inventory/models/room_function.py
new file mode 100644
index 0000000..1aed6f1
--- /dev/null
+++ b/inventory/models/room_function.py
@@ -0,0 +1,16 @@
+from typing import List, Optional
+
+from sqlalchemy import Unicode
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from crudkit.core.base import Base, CRUDMixin
+
+class RoomFunction(Base, CRUDMixin):
+    __tablename__ = "room_function"
+
+    description: Mapped[Optional[str]] = mapped_column(Unicode(255), nullable=True)
+
+    rooms: Mapped[List['Room']] = relationship('Room', back_populates='room_function')
+
+    def __repr__(self):
+        return f"<RoomFunction(id={self.id}, description={repr(self.description)})>"