www.securitymagazine.com/articles/77576-exit-button-1
Exit Button
December 15, 2003

The Essex piezoelectric exit button is a heavy duty, vandal resistant, stainless steel exit button designed for indoor, outdoor, harsh and high traffic applications. With two outputs – one normally open and one normally closed and an adjustable one to 40 second output time, the piezoelectric exit button can be used to control an automatic door, electric lock/strike or magnetic lock.