From the seller

the Spectra S2 Plus is one of the best hospital-grade pumps for building and maintaining milk supply Double Pumping * Pumps both breasts at the same time. * Saves time and can help increase milk production. * Massage (Stimulation) Mode * Mimics your baby’s quick, light sucking at the start of a feed. * Helps trigger your let-down reflex so milk starts flowing. * Expression Mode * After milk starts flowing, switch to this mode. * Slower, stronger suction to express more milk comfortably. * 12 Suction Levels * Lets you choose how strong the suction feels. * Use the highest level that remains comfortable—more suction isn’t always better. * 5 Cycle Speed Settings * Controls how fast the pump sucks and releases. * You can adjust it to match what feels most natural for you. * Closed System with Backflow Protection * Keeps milk from entering the tubing or motor. * More hygienic and easier to maintain because the tubing stays dry. * Ultra-Quiet Motor * Operates quietly, making it suitable for night pumping or pumping around others. * LCD Display * Shows the timer and current settings clearly while pumping. * Built-in Night Light * Two brightness levels help you pump in the dark without turning on room lights. * 30-Minute Auto Shut-Off * Turns off automatically after 30 minutes if you forget.