In order to charge your smartphone or small tablet when you are spending some time outdoors, you are going to need a portable charger. Solar chargers give you the chance to use sunlight to power up your devices. The Solio Bolt is certainly capable of doing so. It is a compact charger with 2 solar panels. It has a 2000mAh rechargeable/replaceable battery inside. You can charge this using a USB port or wall adapter. It holds charge up to a year. Pretty compact charger to have for emergency situations.