It is an external AC-DC power conversion device used to convert household AC power (100V~240V AC) into low-voltage DC power (usually 19V~20V DC) required for laptops, and power and charge the laptops through a DC Jack via a power cord.

It is not a USB external keyboard, but a core input device that communicates directly with the laptop motherboard through a ribbon cable, used to replace the original keyboard on the laptop body.

Laptop cases, including Bottom case / Base Cover ，LCD Bezel / Screen Bezel ，Palmrest ，Bottom Case / Base Cover etc.

It is a physical interface for power input on the motherboard of a laptop (or connected through an extension cord), used to connect a circular or square plug of a power adapter, to import external DC power into the motherboard, to power the laptop and charge the battery.

The flexible signal transmission cable between the laptop motherboard (or graphics card) and the LCD screen panel is used to transmit image data signals (video signals) and control commands generated by the motherboard to the screen, while providing driving power for the screen backlight module.

The active airflow driving component in the laptop cooling module is used to forcibly remove heat from the CPU (central processing unit) cooling fins and maintain the CPU operating within a safe temperature range.