Charging
When the power is low, you need to use the power adapter to charge. The adapter needs to use the specified 5V/1A.
When the battery is charging, the charging indicator is red.
When the battery is fully charged, the charging indicator lights up red (the entire charging process takes about 3 hours). When the battery is fully charged, the product is used for about 3 hours.

- Do not use a computer to charge this device
https://manuals.plus/skybasic/gnimb401kh03-wifi-digital-microscope-manual#ixzz7rGyRZ82R