• Use rechargeable battery as the main supply, lasts 2.5 hours after fully charged Unique Patented Suction Distribution Valve • Full-automatic function,without manual suction release With Adjustable Frequency • You can easily find the frequency which is most effective and comfortable for milk expressing Soft Massage Silica Gel, like milking by your hand • The soft silica gel pad can massage your breast, the comfortable vacuum extrusion is designed to be just like milking by your hand BPA-Free Spare Parts, Safe and Secure • All parts contact with breast milk are BPA-free, bring the safe and trusted milk to the babies every day