This is a extender card for the Commodore C64, C128 and SX-64.  The card features a power LED and a reset switch.
 
The extender card makes it easier to access cartridges and save on wear and tear to the expansion (cartridge) port. In a nutshell it's a Commodore 64 Cartridge Port Saver
 
Take note of the orientation of the card and cart slot. Always switch off the Commodore before plugging/unplugging any cards.
 
Commodore C64, C128, SX-64 Extender Card for use cartridge port.
With a soft reset switch, power led and 5v breakout.
 
Our Commodore 64 Cartridge Port Extender is a handy device that allows you to save your port from wear and tear by extending it. It's easy to use and install, and provides a reliable connection for your Commodore 64 peripherals. It's the perfect choice for anyone looking to maximize their port lifespan and keep their Commodore 64 running smoothly whilst giving easier access to your cartridge/expansion port.
 
Making it easier to excess cartridges and expansion cards and saves wear and tear on the expansion socket.