The Bushnell Bear Grylls SolarWrap Mini is equipped with a flexible, continuous solar panel scroll that you can use to charge an integrated lithium-ion battery. Once the SolarWrap Mini is fully charged, you can plug your portable USB-powered devices into the USB port for charging. If there's no sun, you can use the device's micro-USB port and a wall outlet to charge the integrated lithium-ion battery before you head out for the day. This means that no matter the conditions, you can head out into the field with enough juice to recharge multiple devices. Plus, the SolarWrap Mini solar panels conveniently roll up into an integrated case that can be easily packed away when not in use.