EAX-500 - Surface Mount Battery Powered Exit Alarm - GrayDetex EAX 500 Surface Mount Battery Powered Exit Alarm The EAX 500 is designed for applications that require a battery powered alarm on secured doors. The alarm, with approximately 100dB, will sound when someone attempts an unauthorized exit. The redesigned shape and smaller size of the EAX 500 makes it the choice for quick and easy installations on emergency exit and restricted doors. Also available weatherized. Features Low cost, self contained door