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Simplesse's Double Electric Breast Pump works on compression technology rather than the industry standard of vacuum suction. It's designed to mimic the way a baby feeds, without the friction associated with vacuum-based pumps -- the flexible breast cups conform to a mom’s breast, naturally move with a mom while expressing, and mimic a baby’s tongue and suckling motions encouraging let-down. It's the newest pumping technology, and, with two controls (one for speed and one for compression) you can personalize the speed to your very own comfort level!