Use The Countdown Timer With Lights Or Exhaust Fans To Reduce Moisture, Mold, And Mildew Growth In Bathrooms. Replace Standard Switch With The Maestro Eco-Timer And Never Accidentally Leave The Fan Or Lights On Again. The Timer Has A 1 To 30 Minute Countdown Range, Without An Always-On Option. The LEDs Move Lower Every Five Minutes, Indicating The Amount Of On Time Left. A One-Minute Warning Signals When The Fan Or Lights Are About To Turn Off. Controls A 3 Amp Fan Or Up To 600 W/VA (5 Amps) Of Incandescent/Halogen Or Magnetic Low-Voltage Lighting. No Neutral Wire Required. UL Listed.