The age-old problem of leaving lights on in empty rooms is solved with the Maestro Occupancy Sensing Switch from Lutron. It can detect motion so that it turns lights on when you enter a room and off when a room is empty. This hands-free technology makes life easier when you’ve got an armful of laundry or groceries, and it’s great for a household with kids who might not always remember to turn off the lights when they leave a room. It’s also convertible to manual on/off vacancy sensors for use in bedrooms and homes with pets. You can install it in 15 minutes or less, and it works with all types of light bulbs, including LED, CFL, tube fluorescent, halogen and incandescent. And by using it in place of just one standard light switch, you can save up to $25 in energy costs. Starting at around $20, the Maestro Occupancy Sensing Switch is available at The Home Depot.