diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -22,4 +22,6 @@
 
 ## Reference
 
+* [What HIFI - Sony Bluetooth Speaker Lamp](https://www.whathifi.com/news/sony-glass-sound-speaker-bluetooth-speaker-and-table-lamp-in-one)
+
 ## STL / 3d printing
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