4*2.3*0.6 inches unit size. 0.2 oz unit weight. 0.55 watt solar panel, 2000 mAh rechargable battery. Solar, and USB charging options available to charge built-in battery. It takes 2 hours to charge a cell phone full. 2 days to charge built-in battery full by solar. USB computer charge just for 2/3 hours. 1 pc USB [...]

Save Thousands By Teaching Yourself All About Solar Power. Comprehensive Manual By Industry Expert Guides You Through The Process. Includes All Resources Necessary – Spreadsheets, Insolation Charts, Worked Examples. The Solar Power Design Manual gives you: A simple explanation of how solar power works A guide to choosing the most efficient appliances The best way [...]