2 or 4 wire models * Dual LEDs for 360�‹visibility * Advanced detection and discrimination algorithms * Easy installation and maintenance * Sleek low-profile housing design * Durable sensor head, no need for replacement * SMD circuit board design-satisfactory quality and reliability guaranteed * Integrated heat detector for NB326-H-2 and NB326-H-4 models * N/C (normal/close)-N/O (normal/open)selectable relay output * AR (Auto Reset) function for security systems (optional for 4 wire models) * Sensor base option: standard and Shottky Diode.
