Avent Isis Pump w/ 4oz. Bottle Description: Clinically proven to be as effective as electric pumps, this Avent Isis pump features a Let-Down Massage Cushion for a fast, natural let-down. Combines massage with a gentle vacuum, while all other pumps rely solely on suction. Redefines manual pumping by needing only occasional compressions on the handle after achieving let down; Handle provides fingertip control to make subtle and effortless adjustments Soft massagers flex with each compression to gently massage the area behind the nipple for a natural let down; Massagers work with silicone diaphragm to draw milk gently and consistently