50 Watts gift cards are all virtual. When you order one, you will receive an email containing a unique gift card code which you can send to the giftee. The recipient can use this code at checkout to redeem its value. The cards have no expiration date. (Ignore the automated cart message "Spend x more and get free shipping" -- there is no shipping charge for these.)
Write to will [at] 50wattsbooks.com with any questions.