Vectrex Light Pen

From the box

Interact directly with the built-in screen! The new Vectrex Light Pen is an add-on component that lets you interact directly with the built-in screen to create brilliant graphic effects, compose music, play educational games, even create animation!

No special connections -- plug in and play! The Vectrex Light Pen plugs directly into the Vectrex console. It works together with the built-in control panel and an array of special cartridges that are inserted directly into the console's cartridge port.