If you want to get real techy you can use a ESP8266 or ESP32 along with a analog sound meter like Gravity: Analog Decibel Meter - DFRobot to read a 30db - 130db range into SmartThings using ST_Anything and then setup a automation to alert you when it is above a certain level. But it would have to be powered (5v USB) and you’d have to figure out a enclosure (empty smoke alarm housing?). Plus you’d be looking at at least $50 in parts. Beyond that I haven’t seen anything.
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