The power bank display shows that there are generally two kinds of power.
1. Liquid crystal display.
How much electricity is displayed directly.
2. Four LED lights.
Press the button. One lamp represents 25% of the electricity, and four represent 100%.
Small capacity type, simple structure, only one indicator. When fully charged, the light is green. Sometimes, you need to judge by time. You can't overcharge or overdischarge either.
You can connect it to your phone using Bluetooth