Ａ：

1. An qualified extension cord: (See the picture below)
Please use extension cords with overloading protection devices, and make sure it’s connected to ground.

2. Do not use any unsafe power dividers. (See the picture below)
Do not use multi-directional power dividers without overloading protection devices.

3. Do not connect multiple extension cords together (See the picture below)

Update：2020/6/24