The need to hold the button for four seconds is made so that it does not turn on accidentally in your pocket and does not squander the entire charge. Good device for the city. Has pros: Size. Brightness of light. Possibility of use as a power bank. The smartphone will not fully charge, but adding a few percent to call a taxi or dial a friend will allow. Type-C connector. Its cons: The button is flush with the body, in the dark, to find it, you need to turn the flashlight in your hand several times. A protruding button would look worse, but it would be more convenient. Marked plastic, traces remain on it. Only the head is made of metal, everything else is plastic. There is no magnet. Lanyard on the Chinese paw. The European hand does not fit into it.
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