Autronica manual call point without glass and SelfVerify function. Approved for use in hazardous areas. The BF-500/EX is a manual call point for indoor use in hazardous area zone 0, 1 or 2. It must be connected to the approved AutroSafe barrier BZ-500. The call-point is designed for use with Autronica's interactive fire alarm system, AutroSafe, and consists of a SelfVerify function. This function ensures the highest grade of reliability and the lowest degree of manual testing because all units comprising this function are automatically self-tested once every 24 hours. The BF-500/EX must be installed according to local regulations, which normally means along escape routes, landings and exits.