This is the Premium Commodore 64 Breadbin Power LED Enhancement - IRQ State Bare Board.

Manufactured using the highest quality GOLD PLATED circuit board, when coupled with the appropriate electronic components will result in an IRQ state board that is designed to last.  

When constructed from thisboard, it is a direct replacement for the factory power LED in your Commodore 64 breadbin computer.  The completed unit clips into the factory location once you've removed the original LED.  This is completely reversible if you'd like to eventually go back to the original LED.

How it works is when the CPU generates an IRQ the green LED lights up, otherwise is red, if the IRQ is turned on and off quickly the led is orange.

The small board connects to three points on the back of the cartridge connector inside the case using IC clip connectors.  It connects as shown in the photos to +5V, GND and IRQ.

You will receive one bare board which will allow you to construct this on your own.