Spectra S1

The Spectra S1 is considered a "hospital grade" strength pump- which means that the S1 has the ability to bring in and build a milk supply of a new parent. It also has a built in rechargeable battery for optimal portability. This pump has separate let down and expression modes and night light. You can use this pump to single or double pump.
Spectra S2

The Spectra S2 has all the same great strength and benefits as the Spectra S1 except it does not have the built in rechargeable battery. This pump is able to be used to single or double pump.
Spectra Synergy Gold

The Synergy Gold isn't just pretty it's also mighty! This pump is also considered "hospital grade strength." What makes this pump different is that it has dual controls so that each breast can be controlled independently as you pump. There is also a built in night light. The Synergy Gold can be used for single or double pumping.