Last a few months, we got some feedback and comments on breast pumps, protesting if any drop of liquid or breastmilk drops into the gap of control buttons, the pump will probably not work. Thus, we upgrade the design of control buttons, there's no gap on this model; furthermore, we increase mode and suction levels to need customers' different expressing demands; add a dust cover for better storage; and enlarge the battery capacity from 1000 mAh to 1200 mAh, so it can keep working longer than before.