PowerTraveller EXTREME SOLAR Guia De Inicio Rapido página 3

To charge devices via the USB port , use the supplied USB to Micro
(1)
USB cable or your device's own. Expose the panels to direct
(2)
sunlight with no obstructions (such as shadows or glass), and
readjust every couple of hours to follow the Sun.
The LED indicates the strength of the sunlight reaching the
(3)
panels, with red being low and green being strong enough to
generate a charge.