General Alarm Siren, Model L-120 – The Signal Source
Amazon.com: Y DIANS S Motion Sensor Alarm 120dB Horn Adjustable Volume Tones Waterproof LED Strobe Light Sirens Motion Detector Alarm System for Home Factories, Warehouses and Docks Security AC110-120 V SLA-01W :
A Feather-based alarm clock with sound #AdafruitForums #Feather « Adafruit Industries – Makers, hackers, artists, designers and engineers!