FMM-1 is a standard-sized module (typically mounts to a 4" [10.16 cm] square box) that supervises either a Class A (Style D) or Class B (Style B) circuit of dry-contact input devices.
Economic introduces high quality ceiling speaker model HN-PCP06A/ with stylish grille and frame It is ultra compact ceiling speaker designed to fit in almost any location especially where space is lim