Working Principle It requires no battery, nor does it need to be recharged, it gets the power from your body's energy. When attached the led light on you and go running or jogging, it based on your body's movement bounce up and down, transfer the kinetic energy to electricity in order to light up the LEDs. How to use: With a clip on the back, and coming with 2 velcro straps, attached it to your shoelaces, ankle, arm, waist or clipped onto your backpack, clothing. You also can clip it onto your pet's collar etc while keep running or jogging, the led light will light up automatically, when stop exercising it will light off automatically. Makes you more visible and safer. Built-in 6 LEDs, 15 lumens, it glows white flash. There is no switch, turn on/off depends on your body's energy. It doesn't require great feats of athleticism, you just have to take it with you and go running or jogging. High performance waterproof IPX8 It can be used in a heavy rain and it doesn't matter even dropped into water carelessly. Each safety light with a removable silicone case, it can be replaced and washed if necessary. Long life span Light-weight design(30g/1oz) with high quality. Unlimited working life and we provide 1 year warranty. Please Note: 1) Don't put this light with iron or magnet together. 2) Please attached it vertically and make the light will shake up and down in order to acquire the most energe. 3) It can't store the energy, Light turns off when you stop running. Package included: 2 * safety light (Green * Blue) 1* user manual 2*armbands
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