The Evenflo Feeding Advanced Manual Breast Pump is lightweight, portable, and designed for occasional-use pumping. A manual breast pump does not require power and is great to have to help relieve pressure when your milk comes in, use if baby sleeps through a feeding, or take with you for an extended date night. To help keep you comfortable, multiple flange sizes (24.5mm & 30.5mm) are included with your pump. The flange is the part of the pump you place against your breast. A proper flange fit is important – it not only gives you a comfortable, more gentle pumping experience, but also equates to more milk. If the flange does not fit properly, you may experience discomfort and/or a decrease in your milk expression. The pivoting pump handle will also help you pump comfortably. The handle is easy to hold in either hand and rotates to allow for multiple pumping positions. To pump, simply start with a fast, short pumping motion to help stimulate your first milk release (letdown). As milk starts to flow, transition into a slower, longer pumping motion. If you need assistance, our team of Breastfeeding Experts are available for one-on-one pumping support. In addition, we encourage you to register your breast pump to access your breastfeeding and breast pump education. This deluxe package also contains a variety of pumping and feeding accessories, including: an insulated cooler bag, two ice packs, and one extra breast milk collection bottle with a Balance + Standard Neck Slow Flow Nipple and hood, so you can pump and feed on-the-go.