Easy Operating Manual Brast Pumps Suction Breast-feeding Supplies Brast Pumps Accessories Reviewhttp://tinyurl.com/oo7ewna Easy Operating Manual Brast Pumps Suction Breast-feeding Supplies Brast Pumps Accessories Could have rhythm like baby sucking to promote the secretion of hormonesAdjustable handle can master sucked rhythmAt first can adjust to the fast-paced sucked, can accelerate the secretion of milkAfter the milk flow out, can change to slow suckedBreast pump can be used by adjusting the handle, two sucked the rhythm