Aluminum Alloy Solar Flashlight. Solar Cells: Monocrystalline. Storage Battery: Cadmium-nickel Battery. Seven ultra bright LED. Brightness: 11.9 lumens. Effective Optical Distance: 50 meters. Visibility: 1 km. Shell: Galvanized aluminum alloy. Size: 17X3.6 (CM). Weight: 205 g (including battery ). Patented products, any imitation shall be is not permitted.