Kidde KC2-OSH 2-Wire Photoelectric Smoke and Heat DetectorThe Kidde conventional photoelectric smoke and heat detectors are interchangeable head and base detectors using Optica smoke sensing technology and high accuracy heat sensor that provides outstanding stability and excellent response to a wide range of fires. Like their Kidde Intelligent series counterparts, KC2 smoke detectors feature a photoelectric chamber using Optica sensing technology providing multi criteria response discriminating real smoke