Collect and store, then charge on demand with PowerSync. It's the powerful, innovative technology behind our SolarBook, SolarWrap and Battery Bar systems. Set them out on a sunny day and in no time you have the power to charge your smart phone, camera, practically any device with a USB input. No sun, no problem. With a high capacity Li Ion rechargeable battery on-board, pre-charge them from home with a Micro USB Input and you're ready to go - whatever the conditions.