Upside Down No Longer Plugged Into USB! Positive and Negative Both Joint Listing

The double USB is different from the tradtional one. It has a USB symbol on each side, meaning that in both sides it can be plugged in to transmit data. As shown in the above figure, the USB can be plugged in when the green symbol is up. And when we turn the USB to 180 degree, it would also be plugged in successfully.
The double USB has two contact layers which are both strechy. This always promises one layer to touch the contacts of the fixed interface, no matter which side is up. At the same time, the other layer is pushed in. The above figure shows the using states of two contact layers.