This Amplim Manual Wearable Breast Pump can collect up to 4 ounces of milk at a time and give you the ability to control the suction it uses. Whether you need to relieve your engorged breast or are in a situation where the power source is not available, this Amplim Manual Wearable Breast Pump is designed for you. It's made from 100% soft silicone and PP all you have to do to attach it to the breast is to squeeze the two circles on the silicone, Position the collector onto the breast skin with the nipple positioned in the center of the opening. Release the squeeze to create suction, then Adjust the position of the bra to secure the breast pump. The milk should flow until you've sufficiently pumped. This Manual Wearable Breast Pump does not have mechanical parts or motors. It only needs your hand to create the suction on the unit to get it to work. Breast pumping should not be painful or too uncomfortable. More suction using an electric pump will not make more milk and can cause breast or nipple damage. The unit is compact, lightweight, easy to travel with, and makes pumping on the go much easier. Perfect for travel and it fits easily in a baby bag. A must-have when on the go and didn't know if one could find an electrical outlet. Use silently, discreetly, and quickly when needed. Easy to clean with tap or boiling water. The stopper is designed to prevent milk spills.