The Spectra SG Synergy Gold Double Adjustable electric breast pump offers the most advanced and up-to-date technology in the industry. While traditional breast pumps operate in a unified setting, the SG is the first pump of its kind that permits dual settings. It allows moms to control each side independently! Like all Spectra pumps, the SG is a true closed system that creates a hygienic barrier between outside contaminates and mothers milk. This new technology promotes more productive pumping sessions that save time with comfort and ease. The SG includes two (2) 24mm breast flanges, two (2) 28mm breast flanges, two (2) wide neck bottles, discs, locking rings & caps, two (2) backflow protectors, pair of tubing, two (2) tubing adapter ends, two (2) duckbill valves, and one (1) 12V power cord & ac adapter. If you have questions or issues with any Spectra product, please reach out to our Customer Care team before contacting your original place of purchase. We will happily assist anyone with all questions at 1-855-405-0993.