Super compact, lightweight and made for occasional-use pumping, the Evenflo Feeding Advanced Single Electric Breast Pump is the perfect companion for a busy breastfeeding mom. The closed system design helps prevent milk back up in the pump motor keeping parts clean, dry, and functioning properly. With control at your fingertips, you can easily adjust the pump’s suction and turn the pump on and off using one dial. To help keep you comfortable and pump more milk, multiple flange sizes are included and additional sizes are sold separately. It can be powered via the included AC Adapter or AA Batteries (sold separately)