Bosch D285DH Photoelectric Duct Smoke Detector Head None

Commercial or residential applications Two-wire or four-wire application, depending on base Chamber Check rapid-flash LED Automatic Trouble Indication reports contaminated chamber Flashing LED power indicator Steady-On LED alarm indicator Modular design Color White Operating relative humidity, non-condensing (%) 0 – 93 % Operating temperature (°C) 0 – 38 °C