Charge all of your gadgets whilst enjoying the sunshine, with the Smart Power Solar. Lay the powerbank down in direct sunlight for 40-45 hours to charge the 4000mAh battery. Depending on sunlight exposure, these times may vary. Use the power generated to charge all of your gadgets on the go. Coming in a high quality aluminium casing, with two branding areas the Solar powerbank is a high-end and unique way to charge all of your gadgets this summer.