Dynamo flashlight compares favorably with other flashlights in that it does not need batteries. It is enough to twist the handle, press the lever for a while or just shake it, as the device is ready for work again. There are dynamo lights that shine for an hour after a minute of shaking.
The life of such lamps is limited by the durability of the bulbs built into it. Modern devices use LED lamps, whose service life is ten to twelve years of continuous operation. Therefore, such lights are called "eternal." Dynamo-flashlight is able to charge autonomously indefinitely, unless, of course, damage the structure itself.
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So, drawing conclusions from the foregoing, dynamo lights are reliable and indispensable assistants in travel, hiking, in the forest and mountains, as well as in the city. The main thing is to choose a high-quality device and not to chase cheapness. Check with the seller for information on the power of the device, the time of full recharging, and the duration of continuous operation of the lamp.