1) Please check the battery icon on the left upper corner of real-time preview interface of the device. The power generation voltage of the solar panel will change with the intensity of the sunlight, and if there is a voltage difference between the built-in battery pack and the solar panel, it will be charged. When the voltage difference reaches a certain standard, the battery icon on the APP real-time preview interface will show a charging symbol with "lightning". If there isn't, may be the voltage difference does not reach the certain standard

     If the solar panel faces to strong sunlight but still no charging symbol, and the power will continue to run out, it may be caused by charge issue, please contact the seller for after-sale service

  2) Maybe the battery power is exhausted, you can try to charge the solar panel for about 1 hour with a 5V/2A power cord, and then observe, if it still cannot be charged, please contact the seller for after-sale service

  3) If it is confirmed that there is no charging symbol under strong sunlight and enough voltage difference, it may be a solar panel problem or a line problem, please contact the seller for after-sale service