The new Synergy Gold electric breast pump offers the most advanced and up-to-date technology in the industry. The SG is the first pump of its kind that allows moms to adjust each side independently! Like all Spectra pumps, the SG is a truly closed system, creating a hygienic barrier between outside contaminants and mother’s milk. This advanced technology promotes more productive pumping sessions that can save time with comfort and ease. It includes 24mm breast flanges, 28mm breast flanges, wide neck bottles, discs, locking rings & caps, backflow protectors, tubing, tubing adapter ends, duckbill valves, power cord & AC adapter. <br> Unique and exclusive to Spectra Baby USA, all Natural Nursing Technology vacuum patterns closely mimic the experience of natural breastfeeding. Unlike other products, Spectra breast pumps use a gentle “suckling” pumping pattern that since 2011 has provided productive, comfortable, and successful pumping sessions that moms deserve and enjoy. This means more milk in less time.