Spectra Dual S (Synergy Gold) Dual Powered Electric Breast PumpThe 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 with dual controls that allow for independent settings on each breast! Like all Spectra pumps, the SG is a true closed system, creating a hygienic barrier between outside contaminates and mothers milk. This advanced technology promotes more productive pumping