How does the "4 Months Free" work on an Annual Plus Plan?

When signing up for the Plus Plan, you have two options:

Monthly: Pay $15 each month 

Annual: Pay $120 for the year 

When choosing the Annual plan, you save the cost of 4 months' subscription fees under Monthly. A year of Monthly service is $180 (12*$15), but Annual is only $120.

The $60 you save is equivalent to getting  4 free months! 

Important: all subscription are priced on a recurring basis, in order to stop automatic renewal you will need to cancel the subscription.