Kind note:
1. In order to fully activate the battery, please charge it via outlet for 10 hours at least at the first 2-3 uses. It means that it the best to use 2-3 times before using it for travel.
2. The best operating temperature for solar phone charger is -14°F—140°F, for security reasons, please don't put it alone in the outdoor parked car or other high-temperature environments.
3. Keep the USB port and USB cable dry to avoid physical short circuits inside the solar power charger supply and quit working. If the power bank appears swell, smoke or other unusual phenomena, please quit using solar charger.
4. The energy transformation from solar to electricity is rather slow and the solar charging speed is subject to sunlight intensity and panel conversion rate. In daily life, we highly recommend charge it via wall outlet.