Features:
1) Never needs batteries, 1 LED / 3 LEDs
2) Rainproof, built-in battery
3) Wind up recharge
4) Patented product
5) Ergonomic design, environmental protection
6) Press the button 4 times for a circle: 1LED on-off, 3LEDs on-off
7) 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)
8) Hint: great for cars, boats and campers and all emergency kits

Specifications:
1) Size: 7.5 x 7 x 6.8cm
2) Net weight: 100g
3) Luminosity: 60,000mcd
4) Power: 2.5W
5) Material: ABS