How to Charge
Please carefully follow the instructions below.
- Insert the USB plug of the charging cable into the USB port on your computer or a USB wall charger.
- Hold the other end of the charging cable near the port on the back of the watch until it attaches magnetically.
- Make sure the pins on the charging cable lock securely with the port. The connection is secure when the watch vibrates and the charged battery icon appears on the screen.

https://manuals.plus/kalinco/p22-smart-watch-manual#ixzz7qWmEK4n2