I don't know if this link will work - https://www.chargerlab.com/wp-content/uploads/2022/06/2022061718103949.jpeg https://www.chargerlab.com/wp-content/uploads/

I don't know if this link will work - https://www.chargerlab.com/wp-content/uploads/2022/06/2022061718103949.jpeg https://www.chargerlab.com/wp-content/uploads/2022/06/202206... but that metal round pin thing is a ground; and the three-prong cable connects to it.