The POWERplus Gibbon is a high-quality solar charger with built-in voltage transformer. This generates an output of 5 V (USB). The ETFE layer protects the solar cells from scratches, dust and water and guarantees a long service life. The Gibbon has a tested solar cell power of 5 W. This product has an average maximum output power of 3.5 W. https://elecena.pl/product/21769191/solar-system-5-w-usb 2022-10-07 https://elecena.pl/product/21769191/solar-system-5-w-usb 2023-06-04