From the seller

1. Natural Motion Technology gets milk moving quickly*: With a gentle latch-on and just the right massage and suction, milk starts to flow in as little as one minute 2. One Size Fits All : Whatever your shape, the pump's soft, flexible silicone cushion meets your breast and nipple comfortably. Fitting 99.98% of breast sizes*, it adapts for a latch-on that's soft yet secure. 3. 8 stimulation modes, 16 expression modes : 8 modes for stimulating the flow of milk and 16 modes for expressing it. 4. The memory function automatically stores your last stimulation and expression settings. One-touch pause/play : lets you take a break from your session then resume it whenever you're ready. 5. Whisper quiet motor keeps sessions relaxed : So you can express at home (or anywhere) discreetly, and with one less distraction. 2 years warranty & BPA free