diff --git a/custom_components/powercalc/data/signify/LTW001/model.json b/custom_components/powercalc/data/signify/LTW001/model.json
index d248e23ed..8821c7252 100644
--- a/custom_components/powercalc/data/signify/LTW001/model.json
+++ b/custom_components/powercalc/data/signify/LTW001/model.json
@@ -5,5 +5,6 @@
     ],
     "measure_method": "script",
     "measure_device": "Shelly plug S",
-    "measure_description": "Used script utils/measure_shelly.py from repository"
-}
\ No newline at end of file
+    "measure_description": "Used script utils/measure_shelly.py from repository. Standby usage is guessed",
+    "standby_usage": 0.4
+}