Medela harmony is a single, manual breast pump designed for occasional time away from baby.harmony is the first manual breast pump with 2 phase expression technology that is designed to mimic baby's natural sucking rhythm. this means that more milk can be expressed in less time. as a lightweight, manual breast pump, harmony provides silent and discreet pumping, is easy to transport and therefore suitable for use at home or on the go. the ergonomic handle provides easy intuitive and comfortable pumping. medela harmony is easy and simple to use, clean and assemble