As a doula, I recommend this silicone breast pump to many clients. It is tubeless and does not require an outlet or batteries. This pump is used by attaching it to the breast by hand, creating a suction by squeezing just a wee bit to begin the natural let down process. It's also a great tool for clogged ducts by filling with warm water and a few tablespoons of epsom salts and attaching to the breast.