If you select a Prepay & Schedule, you are making a one-time payment for multiple deliveries (either 4, 8, or 12), and schedule each delivery to best suit you. You select your first delivery date when you purchase. You can then schedule the remaining deliveries in your account at any time. This plan does not automatically renew, and will expire one year after purchase. If you are looking for a more flexible delivery option, PrePay & Schedule is best for you.