The game comes out on 10/11/16 but you can download early. This title is multi-platform meaning you buy it for PC and you can play on Xbox as well.
These keys are good for the download of Gears of War 4 for PC, and when you redeem it on your microsoft account you can play on Xbox.
This is the cheapest you will ever see these keys.
Upon purchase you will receive an email with the product key as well as the website you redeem it at for your free download.
AUTOBUY:
Gears Of War 4 Product Key - rocketr.net