Compare the S12
1- Double sealed flange design, snug tighter and closer to your breasts
2- Longer battery life - S12 ully charged for 3-4 pumping sessions, but S12 Pro ully charged for 7-8 pumping sessions
3- Bionic modes matches - the upgraded 3 modes (stimulation + expression + mixed)
4- Charging time, S12 Pro can be fully charged in 130 mins (5V 1A), saving 50% time
5- LED large panel design - clear and convenient to track the pumping time and battery power