Use of solar energy, high efficiency, pollution-free, . Construction: Aluminum Alloy. Solar panel: mono-crystalline silicon or polysilicon Battery: rechargeable, nickel-cadmium battery .LED: 5 white LEDSolar cell charging time: 8hours Continuous working time: 15 hours continually Brightness: 17 lumens; Visibility,2 km; Effective Optical Distance: 50 metersFeature: White light beam. ...