The Emergency Lockdown Station is ADA Compliant. It’s push button switch can cover a wide range of applications both indoors and outdoors. It incorporates a unique, patented design that helps dramatically to stop accidental activation. Because of it’s superior, patented design combined with quality construction throughout, you can expect outstanding performance for years to come. The Emergency Lock Down Station has a piezo siren so when the front cover is opened, it notifies people in the surrounding area. The 3V CR123A battery will typically last for 1-2 years.