This study is testing a new birth control patch called a **progestin-only transdermal system**. A transdermal system is a patch that sticks to your skin and releases medicine over time. **Progestin** is a hormone that helps prevent pregnancy. The study will check how well this patch works and if it's safe to use. It's important for women who can't use birth control with estrogen, another hormone.

Women who want to join need to be healthy, not pregnant, and have regular periods. They should be at least 16 years old. Participants also need to agree not to use other methods to prevent pregnancy during the study.

• The study will last about 1 year, and you will need to visit the clinic several times.
• Women who are pregnant, planning pregnancy, or are allergic to the patch should not join.
• Participants must be ready to follow the study rules and attend all visits.