Plug in timers save you money buy turning on and off your lights when they are needed. No need to remember to turn your lights off, with a plug in timer just set it once and forget about it. The electronic programable timer allows you to set on and off schedules for every day of the week so that weekends are no problem.
Need something on for a set amount of time, use a wall switch timer. It allows you to push a button for a set amount of time that the light or fan will come on. When it times out it will turn your lights off till you return and push another button. Great for bathrooms and laundry rooms.