<b>Key Features:</b><br><br> 1. Waterproof<br> Beam backpack is fully waterproof and features YKK Water Resistant Zipper to keep any water at bay!<br><br> 2. Reflective Logo<br> The LED illuminated in sun or shade, day or night, and when charging your devices.<br><br> 3. Ergonomic Design<br> With beam backpacks ergonomic design and compression shoulder straps it stabilises weight on your lower back. A traditional backpack pulls down on shoulders and concentrates weight on lower back.<br><br> 4. Anti-theft Buckle<br> Our anti-theft buckle system allows you to lock the buckle around anything preventing theft.<br><br> <b>Miasolé - Flexible Solar Cells</b><br><br> CIGS solar cells:<br> Copper Indium Gallium Selenide (CIGS) is a thin-film solar cell used to convert sunlight into electrical power.<br><br> Technology:<br> This technology has a conversion efficiency of 19.2%. It sets the world record for CIGS sputtering technology. It adheres directly to surfaces and is lightweight, ultra-thin and flexible, making it an excellent power source for solar-powered products like backpacks.<br><br><br> <b>Principle of Operation</b><br><br> Option 1: Solar panels ---> voltage regulator (steady output current) ---> digital devices charge<br> Option 2: Solar panels ---> voltage regulator ---> USB adaptor ---> digital device<br> Option 3: Solar panels ---> voltage regulator ---> power-bank (store energy) ---> USB adaptor charges your devices<br> Option 4: Household electrical outlet --->USB adaptor ---> power-bank<br> (If charging your phone, we recommend Option 3)<br><br>