... controller Model:HY-S371KA (three wire system) Feature & Applicability:Dual power with fire mode electronic intelligence mainly use for stair and ... start working when the sound ≥52dB+8dB, auto close after 60S±20s.With power saving, no contacting, no spark, longevity, ... lamp, daylight lamp )Notice & Precautions:Please cut off power before installation, to avoid cutting-out or overloading.The product ...