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This is the simplest LED flashlight in the world!
No twists, No buttons, Just put the LED side to the positive side of the battery and the other side to the negative side of the battery. The magnets inside the flashlight will make the two parts into a complete flashlight. The battery is the handle of the flashlight. Dont be afraid of the safty, the 1.5 vlots AA battery is no harm to humans.
Less structure, Less metrial, More eco-friendly.