There are 5 indicators on the solar charger.

One is a solar charging indicator, which lights up in green when exposed to sunlight.

The other 4 blue indicator lights indicate the battery level.

When you press the power button, you can see the remaining power at a glance.

1 LED light: indicates that the power is within 25%

2 LED lights: indicates that the power is within 25%-50%

3 LED lights: indicates that the power is within 50%-75%

4 LED lights: indicates that the power is within 75%-100%

With these 4 LED indicators, it is easy to know the remaining power, and there is no need to worry about sudden power failure when going out.

Warm Tips:

1.Please fully charge the solar power bank before the first using, and use USB cable & your 5V/2A adapter to charge the high-capacity 20000mAh solar charger.

2.If you want to let the two devices charger together (two devices, each output 1A) will charge a little slower, but a device will charge 5V/2.1A outputs high speed, so charging will be faster.

3.Please kindly note that solar charging is for emergency use,because it's difficult to produce intensive power via sunlight due to sunlight intensity and panel conversion rate. Please keep more than 25% of the electricity before charging via sunlight.

4.This product is equipped with a solar panel, so if there is sunlight or a light source, the lamps will blink in order. This is by design.

5.This question about the USB cap is tight. The easiest way is to place 1st 3 fingernails under the cap and lever upwards.

6.The best operating temperature for solar phone charger is -14°F—140°F. For security reasons, please don't put it in a parked car or other high-temperature environments.

7.Please do not take solar as a primary charge source. Solar charging is a charging way for emergency use, and solar panel charging efficiency will be influenced by natural conditions and random factors. The energy transformation from solar to electricity is rather slow and solar charging is not obvious. In daily life, we highly recommend charge it via wall outlet.