The Simplex 4098-9714 is an analog and addressable, replacement, photoelectric smoke detector head. The Simplex 4098-9714 sensor head is designed to provide 360 smoke entry for optimum response to smoke from any direction. Due to its photoelectric operation, air velocity is not normally a factor, except for impact on area smoke flow for the Simplex 4098-9714. This photoelectric detector can be used with the 4010 and 4100U series control panels from Simplex.