Sensors | Chick-a-Dee detects smoke and chirps louder and louder

Bird-Shaped Smoke Detector Chirps Louder As Smoke Thickens
“The Chick-a-Dee is a simple design that brings a fresh twist to traditional smoke detectors. The device is designed to look like a bird perched on a branch and gives out friendly chirps when it detects smoke. As smoke thickens, the sound becomes louder and more sustained at 85 decibels.”

via @PSFK