BN-LINK Countdown Digital in-Wall Timer Switch with Push Button 5-15-30-60mins, 2-4hours,for Bathroom Fan,in-Wall Light Timer, Neutral Required, Free Wall Plate, White,

The timer switch replace standard single-pole wall switches for energy savings throughout the home. It turns controlled lights or fans OFF when the selected time expires. Turning lights ON with the timer is accomplished by pressing the desired time selection or ON/OFF button. Lights can be turned off before the time-out setting expires by pressing the ON/OFF button. To change the time-out setting, press the desired time selection button and the timer will reset to that countdown interval.