Auto On/Off : Turn the switch to "ON" position. The solar warning light will automatically charge during the day and automatically turn on at night,it can work 40 hours after charging fully. Frequent Flashing: It flashes times/min with 6LED bulbs, and the visual range is over 500-1000m under the darkness. Waterproof:The solar strobe lights is rating which can withstand all kind of terrible weather, such as foggy, downpours rainstorm, blizzard or daily heat. Saving Energy and Money: Our solar lights are completely charge from solar energy, which can save your money and no energy will be wasted. Wide Applicable Usage: Suitable for bridge, marine, night driving, garden architecture, urban lighting, factory, fence, road guardrail, truck roadblock emergency, construction, traffic safety, etc.