Autronica manual call point without glass and SelfVerify function. Approved for use in hazardous areas zone 2. The BF-500/N is a manual call point for indoor use in hazardous area zone 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 comprises the 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/N must be installed according to local regulations which normally means along escape routes, landings and exits.