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1) Rainproof, built-in battery
2) Wind up recharge
3) Patented product
4) Ergonomic design, environmental protection
5) Press the button 4 times for a circle: 1LED on-off, 3LEDs on-off
6) When the built-in battery run out of power you can charge the battery by
matched wind-up charger (connect the product with charger by the charging
cable; crank the handle of the charger at the speed of 2.5-3circles per second
to charge the battery)
7) Hint: great for cars, boats and campers and all emergency kits