LED is in the daily life of almost all people are using, generally appear in the LED key ring flashlight, watches, remote control, television systems. Over the years, LED has also been used for various sizes of flashlights. There are many LED flashlights better than ordinary traditional flashlights. LED flashlight is the use of new technology, the old flashlight is constantly being replaced. People use the LED flashlight to find its advantage is relative to the traditional flashlight, LED flashlight has a condenser effect, it is more practical than a light bulb. An LED flashlight, the most common example being made by almost everyone who owns, and as a toy by other people as an emergency light glowing keychain. The LEDs are very unique and their work is different from the traditional light bulb which is made by the filament inside the glass case when it is heated, and it is made by the negative and moving the glass between the positive terminals of the LED bright. Another advantage of LEDs is that they are easy to heat, so they have a longer life than ordinary bulbs. The filament can be vaporized in the bulb, and it is lit when the heat is generated, but the LED does not emit with heat, so they last longer than a bulb. LED battery charge less than ordinary light bulbs, so it can be more energy than conventional flashlight energy saving. In addition, people in the dark case, it is not easy to use the traditional flashlight. LED flashlight and other LED key ring torch light used by all ages are also different uses such as flashlights or toys, laser lights and so many children play. An LED key ring flashlight is the best example of the latest technology into existing old products. Previously, people used to light bulbs with bulbs, fuses were easy to burn out. But with LED will not be such a problem. As a result, the LED flashlight is advanced and thus much better than the traditional torch used in the past.