https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.aliexpress.com/item/32952674702.html&ved=2ahUKEwig-caay_SKAxVGrlYBHSi5BC8QFnoECB0QAQ&usg=AOvVaw23mGAQKPbvpVrMDACIEiWT
부저를 달면...
https://www.youtube.com/watch?v=X_-TY3kvt6o
14분 35초 부분