How loud is the audible alarm? Michael T August 21, 2020 17:40 Updated The alert alarm is 80 decibels. Related articles How can I test if my sensor is working? What does the negative number by my sensor mean in the mobile app? Sensor Details and Specifications How do I know if a sensor is connected? How much water does it take to set off the alarm? Comments 0 comments Please sign in to leave a comment.