Description:Just squeezing the pump suction Designed for comfort and using a massage cushionSpecially designed to emulate the way a baby suck， making the acquisition of milk easily Applicable to the nipple flat and inverted nipples，can suck out of the nipple retraction， can massage the chest let breast diastole， help breast held firmCaution:Please Clean and sterilize them before/ after each using!Package Included1pc x Nipple sucker