A timer switch is a device that controls the on and off the timing of electrical equipment such as for appliances and devices. An electric timer switch can help to conserve energy which works by either an automatic function or digital display and can often be set like a heating control to turn on and off at set times daily, on a 5-day 2-day basis or for seven days. A timer switch for lights can fit over existing light switches, a simple and useful method without the need for wires or complicated installs, allowing lighting to be turned on and off on a timed basis. A socket with a timer ensures that no valuable sockets are lost to the timer itself.