... 100W Three-wire system ceiling energy saving controller Sound and light controlled energy saving controller Model:HY-S373K (three wire system) Feature ... power saving, no contacting, no spark, longevity, Security and ReliableApply to: stair passageway, gallery, wash room, garage ... saving lamp/daylight lam/LED lamp≤80Wconnection:three-wire system,inductivesize:46*31*18mmlight sensitivity:7LUX ±2LUX ...