Dont buy it! I used it for 2 weeks and it worked just fine -- was able to get 4 oz within 7 minutes, then all of the sudden, it stopped working. It would still pull at my nipple but nothing would come out -- I would constantly have to readjust the sheild to get more. I called customer service and they said that it was a lactation issue but with another pump I have no problems. DONT GET IT! Buy a hands-free one so that you can walk around the house - you dont want to be tied down to the machine.