Lutron MA-T530GHW-WH Maestro Eco-timer, White Use with exhaust fans to reduce moisture, mold, and mildew in bathrooms Use with lighting to ensure lights are never left on for a long period of time Tap on to start timer; touch rocker to adjust countdown time 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