This is our Second largest solar panel, water resistant, with a USB mechanism to restart as a cloud goes over the sun. Not all USB solar panels have this device.
Using USB solar panels its important to Note,
Charge a power-bank not your cell phone.
Leaving a expensive cell phone in the sun is not a good idea. We use our solar panels for a wide range of uses, from charging power-banks, to lights, even two way radios, they can also be used to trickle charge a vehicle battery .
The larger the Solar panel the faster it can be used to charge a power-bank.
Always face the panel towards the sun on a angle for maximum charging speed.