Advanced Performance: BigBlue 28W portable solar charger provides 20% more power from every ray, thanks to shadow-free surface design (No metal lines on the front panel). Engineered heat resistance and advanced N-type solar cells offer superior Low-Light efficiency and extending operational longevity Upgraded Triple-Port: Dual USB-C and one USB-A ports deliver a maximum output of 5V/3A each, collectively achieving 5V/4.8A. This solar panel charger empowers simultaneous multi-device charging. Please note that the portable solar panel can't store the electricity and must be used in direct sunlight while connected to your devices