Closed System:
There is no way for milk to get into the pump motor (hygenic for both moms and babies, a feature missing from many very well-known brands)
Hospital Strength:
With a suction that exceeds 320 mmHg, Spectra S2 is the most efficient yet gentle pump there is.
Massage Mode:
Simulates the natural suckling of a baby and encourages a speedy letdown.