BPA free: FDA approved and all parts contact milk are made of 100% BPA free material, which makes it convenient to clean & sterilize Super quiet & anti-backflow design: Very low noise when the pump is operating, which makes it very convenient for milk extraction when the baby is sleeping; larger air cup and anti-backflow design prevent milk flow to pump, which make it more durable & safer Large LCD: Shows current model/time/ suction level/battery consumption level, which is easier and convenient for operation at night Adjustable suction mode with massage function: 9 Gears provides an optimal & comfortable lactating experience, which is labor-saving and time-saving High efficiency: Suction pumping design allows for powerful pump pressure, which enables milk extraction more efficient and effective. Imitating baby's natural sucking rhythm, make breast pumping more comfortable. Installed Li-Ion Rechargeable Battery