Zomee Z2 Double Electric Breast Pump Zomee Z2 (1181796_CS) 12/CSThree different pumping styles massage mode, two phase mode and expression mode The anti backflow design provides a hygienic closed system to keep breast milk from backing up to the pump, prevent infection and keep milk fresh. The easy to use interface consists of just six buttons. The digital screen displays information such as the current mode, the suction level and elapsed time. USB rechargeable internal battery gives you to flexibility to express