diff --git a/const.py b/const.py
index 0858b68..813beb3 100644
--- a/const.py
+++ b/const.py
@@ -13,6 +13,7 @@
 CONF_ZONE_TYPE = "zone_type"
 CONF_PARTITION = False
 CONF_MAC_ADDRESS = ""
+CONF_SERIAL_NUMBER= ""
 CONF_MODELO = "Active"
 DATA_AD = "jfl_active"
 DATA_REMOVE_STOP_LISTENER = "rm_stop_listener"