Agni AD-912 series detectors meet the requirements of UL 268 and EN 54-75 for use in Fire Alarm signaling systems. They are intended for use in 2-wire4 wire Class A or B supervised zone circuits. The AD -912 Series detectors are subject to panel compatibility limits and compliance with corresponding NFPA 72E standards, local codes, and ordinances. Standard Features 2 Wire Models 2 LED's for 360-degree visibility Advanced detection and discrimination value. Easy installation and maintenance. Sleek low Profile - housing design. Durable Sensor head, no need for replacement. SMD circuit board design, satisfacation, quality and reliability guaranteed.