It is specially designed to collect the leaking milk while nursing on the other side. It pumps out the milk from your breast by the natural pressure. It is more gentle and pleasurable than using electronic pump that may hurt your nipples by strong suction. It is also soundless while pumping. Your baby deserves to have a quiet moment instead of the noisy motor sound while nursing. With its soft and ultra-light design, it is the best traveling pump you have ever found in the market. You do not have to worry about running out of the batteries or breaking the pump accidentally on traveling. It’s manual.