Natural Nursing Technology: Our Spectra S1 electric breast pump features technology that allows comfortable suction levels that mimic the experience of natural breastfeeding as closely as possible Perfect for Travel: The Spectra S1 pump is portable and rechargeable, making it ideal for an on-the-go mom, with the back compartment that fits a Spectra bottle Single or Double Pumping: Can be used as a single electric breast pump or a double electric breast pump and for best results, authentic Spectra Baby accessories are recommended Complete Pumping Accessories: Receive all pumping accessories compatible with S1 pump so you are prepared to begin your breast pump journey Convenient Storage: The grey breast pump tote creates convenience for carrying your pump, bottles, and pumping essentials on-the-go and also Includes laptop storage.