Timer switches are an easy way to control how long your lights are on. In the past, installing these switches meant hard-installing special switches to go with your lights. New technology couldn’t be easier: Timers now simply go over your light switch and can be activated to turn on or off through your smartphone. There are no special tools needed; you just place it over the switch, and a mechanism switches the lights for you. Over time, using a timer can help you save electricity and money.