It is a single matchstick sized rod that is placed underneath the skin on the upper arm by a health provider. It contains progestin which once inserted is slowly and continuously released which in turn prevents the release of an egg from the ovary.

It also thickens the cervical mucus making it difficult for sperm to reach egg. It is good for women seeking long-term birth control. It can be effective for three years or more before getting a replacement. Also its hidden nature and effectiveness are a plus for this method.

                            
           Images above show a nexxplanon and the location where it is placed under the arm respectively