... Three-wire system LED sound controller Sound and light controlled energy saving controllerModel:HY-S372K (two wire system) ... close after 60S±20s.With power saving, no contacting, no spark, longevity, Security and ReliableApply to: stair passageway, gallery ... ±2LUX decibel:52dBdelay time60s±20sapplication:filament lamp ,energy saving lampNotice & Precautions:Please cut off power before installation, ...