This pump has 14 total pump modes so you feel in complete control, massage modes mimic your babys latch to stimulate milk flow. Youll feel 10 short pulses followed by one longer pump, then it will move onto a more powerful mode that you control by simple + and - buttons. Once your breast milk starts flowing, use the 9 expressing modes for a more regular and prolonged pumping action to help you comfortably express as much milk as possible. , , The portable power unit is so small you could fit it in your pocket, and it weighs in at less than half a pound. The pump itself is so small and light you can just throw it in your bag and be on your way!. Go with the flow - every mom expresses different amounts at different rates. whatever is your normal, this pump has an led screen to show your pumping times, and comes with a closer to nature bottle with measurement markers to see how much youre collecting.