The LiPo Charger is extremely affordable and easy to use. No programming is required. Plug it in and it works. The internal charger IC handles all the power flow between the various components.  The LiPo Charger board will Show red LED to alarm when the battery is low power, or it will show Green. It allows you ride the solar wave to run your favorite 5V device. The LiPo Charger board is the ideal green power solution for your outdoor sensor design. Attach the LiPo Charger board to your sensor board and it can run on solar power forever! It can also be used to charge mobile phone.  In case solar power is not sufficient, the microUSB port allows you to charge your lithium battery through USB. It can also be used to program your kit without detaching the LiPo Charger board.