I have three months using an electric breast pump in the hospital, and when my premature baby and I've finally come home I ordered these hand pump to pump at home can continue. The problem is with the electric pump I have in 20 minutes. about 150ml pumped. In order to pump the same amount with the hand pump, I have more than 1.5 hours needed !!! Her hands hurt and the child cries of hunger. Unfortunately, not usable, and, unfortunately, no longer returnable because already used. Waste of money.