With a eufy breast pump, you can make a stock of milk and keep the milk production going. The eufy breast pumps are electric and has 2 units. That way, you use the 2 breast pumps at the same time and pump a large amount in one go. They fit in a nursing bra, so you can keep your hands free during pumping. The eufy S1 and S1 Pro have temperature settings to improve the milk flow. Want to pump on the go? With the S1 Pro, you receive a useful charging case.