The unique silicone diaphragm provides a guaranteed 100% reliable, comfortable suction without the need for noisy motors or batteries found in electric pumps. As you pump, five petal shaped massagers flex in and out, gently massaging the area behind the nipple. The result: more milk faster and more naturally than with any other breast pump. The kit includes: Isis Breast pump, 2-4 oz milk storage bottles, 2 newborn nipples, Nipple travel pack and 2 sealing discs which convert bottles to storage containers.