First offered as a bonus for retail backers of the Kickstarter. Now included as part of the expansion "On Mars: Alien Invasion". This promo was later available during the Game Boy Geek Season 10 Kickstarter campaign. This listing is for a single card.
The beacon is a blueprint card, which allows you to, as an executive action, either construct or upgrade a building by spending two crystals or having one battery specialist.
For more information, please refer to the BGG listing.
Part of the Game Boy Geek Promo collection.