The stand typically has a built-in battery that can be charged via a USB port. When you need to charge the phone, you can place the phone on the stand and connect the charging cable between the stand and the phone, and then turn on the switch of the stand to start charging. A battery inside the stand transmits power to the phone to charge it. In addition, some electric phone stands can also support wireless charging, just need to align the stand with the phone to start wireless charging.