Empress Mimi subscriptions automatically renew every month until you cancel your subscription.
If you cancel after the cancellation window (48 hours before renewal), you will still be billed for that month's box. You will be able to return your box for a full refund.
If you purchased a multi-month subscription (3, 6 or 12 month option) cancelling your subscription will cancel the subscription from renewing, but any remaining boxes on your plan will still continue being sent. For example, if you signed up for a 6 month subscription and cancel in month 5, you will receive 1x more box. After this your subscription will no longer renew.