diff --git a/src/escpos/escpos.py b/src/escpos/escpos.py
index 9c13dd5..a9cf821 100644
--- a/src/escpos/escpos.py
+++ b/src/escpos/escpos.py
@@ -133,7 +133,7 @@ class Escpos(object):
         self.close()
 
     @property
-    def device(self) -> Union[Literal[False], Literal[None], object]:
+    def device(self) -> Union[Literal[None], object]:
         """Implements a self-open mechanism.
 
         An attempt to get the property before open the connection