You are bidding on a digital gift card for $50 to Shake Shack that does not expire.  

https://shakeshack.com 

This gift card is accepted at participating Shacks (sorry, not valid for app purchases, kiosk or delivery orders or at stadiums, airports, travel plazas, venues or locations outside of the United States). This card doesn't expire, and Shake Shack doesn't charge any usage fees. Treat this card like cash. By using this card you accept these terms and conditions.