One handed manual breast pump is a manual breast pump. It is a single pump, which means the user can only express milk from one breast at a time. It comes with a flexible flange, called a flexi shield that can be inserted into the plastic cone that fits over the breast. This flexi shield helps stimulate the areola area and ensures a better fit. The suction strength and cycle of the breast pump is controlled by the user, and requires only one hand to operate.