<prompt> The progestin present in Sino-Implant II isEtonogestrelLevonorgestrelNorethisteroneDesogestrel  <response>: The Sino-Implant II is a less expensive two-rod levonorgestrel system manufactured in China and available in several countries. It is effective for 4 yearsReference: Novaks gynaecology; 14th edition; Chapter 10; Family planning 