The FRM-1 Relay Control Module is intended for use in intelligent, two-wire systems where the individual address of each module is selected using the built-in rotary switches.
This unique and patented device has been helping stop false fire alarms around the world for more than 25 years, without restricting legitimate alarms.
HN-A500I is a high efficient 500W Power/Booster amplifier provides audio signal amplification for public address and voice alarm system, It is reliable, efficient and light in weight.