1,For the first time using, please charge the product under the sun for several hours before working. 2,When the light flashes, it means that the power is very low. Please immediately take it to charge, otherwise, the product will stop working soon. 3,The charging performance of solar panel depends on the duration of light andweather conditions. 4,Solar panels will be covered with dust because of long-term use in the outdoor.In order to receive better charging performance, please clean it up when necessary..syi