3 months free with Prime USA membership, 1 without.
Kindle Unlimited is a monthly subscription service that gives members access to more than four million digital books, audiobooks, comics, and magazines.
Once you activate your subscription, you can start downloading titles from the Kindle Unlimited catalog immediately.
Kindle Unlimited works on all Kindle devices, and on your phone, computer, or tablet through the free Kindle app.
A subscription allows you to borrow books and other content with no return due date. Kindle Unlimited members can read and hold onto up to 20 titles at a time before returning them.
In the U.S., a Kindle Unlimited subscription normally costs $11.99 a month plus taxes. Memberships—which you can cancel at any time—are available in the U.S., Canada, Mexico, UK, Brazil, Japan, India, France, Germany, Italy, Spain, and Australia.