High Capacity: Built-in 38800mAh high-capacity polymer battery equipped with a compact solar panel, which could recharge the battery itself under sunlight, eco-friendly and ideal for outdoor activity.- Dual USB and Powerful LED Light: Makes it easy to charge two smartphones simultaneously or a tablet at full speed. 2 led lights can be used as flashlights with Steady-SOS-Strobe mode. Five pilot indicators show the status of the battery charger timely. The green light is on when charging by solar, blue light is on when USB charging.- - Superior Portability Design: Easily hang it on your backpack with the carabiner, hands-free on the go. Build-in Lithium Polymer battery cells, anti-explosion, lightweight, compact and reliable.- - Universal Device Compatibility / Dual USB Port: Creative solar phone charger compatible with smartphones, tablets and other electronic devices and charge 2 devices at the same time.- - Kindly Note: External battery charger with solar panel can recharge by solar or outlet. But please do not take solar as a main power source. Its subject to sunlight intensity and panel conversion rate, which may take a long time to charge.-