Is the birth control patch hormonal or non hormonal? Asking reasons read below

I recently gave birth and exclusively breastfeeding and I plan not to stop anytime soon. I don't want a hormonal birth control which will effect my milk. I am not looking for IUDs just Abit paranoid of having anything up in me... If it's hormonal what are the best birth control for when you're breastfeeding? I want to wait about 4 years to have another one.

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