Flashlights are very useful resources. Everyone needs to keep at least one flashlight on hand for emergency power outages. There are many different types of flashlights.
The first flashlight type is the tube flashlight. This is the traditional flashlight type that most people grew up using from early childhood. These flashlights can vary quite a bit in size, length, power and weight. All of these are battery-powered, and can easily be held in one hand.
Another flashlight type is the pocket flashlight. These are smaller flashlights that can be kept in your pocket and attached to a key chain. Pocket flashlights are very useful, easy to store and they also tend to be fairly inexpensive. The big drawback with pocket flashlights is that they don't have much power. They'll work fine for most daily use, but they won't be all that great for very heavy-duty jobs.
One of the newer flashlight types is the shake flashlight. These devices use neither batteries nor bulbs. Instead, they are equipped with light-emitting diodes (LED). To charge the flashlight, you only need to shake the unit for about 30 seconds at a time. This provides the power to operate for a couple of minutes before it needs another good shaking. The drawback to these is that they tend to be more expensive.
A headlamp is a flashlight that is worn on the head (usually strapped or mounted to a helmet) to free up your hands. These are very handy for miners, construction workers and spelunkers. The lantern is traditionally bigger than a regular flashlight, and it also burns brighter. They can light whole rooms, and usually have handles for gripping or to hang them from objects, plus bases that make them easy to set on tables or flat surfaces.