Promate SolarBank-20 makes your trips and outdoor activities power-packed with the high-capacity 20000mAh battery power bank with an integrated LED light. SolarBank-20 sports a built-in high-grade solar panel, which lets you charge the power bank at faster speeds even when outdoors. You can also transform the power bank into a portable LED light, making SolarBank-20 one of the most versatile power banks.