Graphic Overlay:
The top layer is a graphic overlay that usually contains different icons, labels or text to represent different operating options of the charger, such as switches, charging mode selection, battery status indication, etc.

Circuit Layer:
Located beneath the graphic overlay, the circuit layer contains conductive traces that are used to detect actions such as button presses, selecting charging modes, or initiating the charging process.

Spacer Layer:
The spacer layer is usually located below the circuit layer and provides support and tactile feedback when the button is pressed, ensuring correct button operation.

Adhesive Layer:
The adhesive layer tightly bonds the various layers of film together to form an overall structure to ensure stability and durability.

Backer or Substrate:
The bottom layer provides structural support and is usually made of sturdy materials to ensure stability.