do not buy this product. it does not work. i bought it at walmart and thought it would be good for the money. it is very uncomfortable and doesnt last. i had it about a week and it just wasnt working. the even bigger problem is that once you use it there is no returning it! i had to get another pump and lost my money. im very disappointed. other people i talk to said they had the same problems so i know it wasnt just my pump.