Features : 1.First 2 in 1 Electric Breastpump in the world :fully automatic(suck-release-relax cycle function)and semi-automatic (manual suction release funtion ).An adjustable vacuum allows you to select the suction level that is most comfortable for you. 2.KU.KU Duckbill Electric Breastpump fully automatic function mimics the natural suck-release-relax cycling of a nursing baby and offers unique comfort and safety. 3.The ergonomic breastshield fits the breast firmly and effectively extract milk. 4.This pump is the only single-hand-held electric/battery operated breastpump on the market with automatic and semi-automatic functions. Easy to use and clean. 5.This pump comes with a companion transformer that allows you to plug it into any electric outlet. Or power the pump with two AA batteries. 6.Breastshield insert massages while you pump and stimulates the breast to produce more milk. 7.Its light weight and stylish design that make extremely portable and it is durable and reliable enough for many years of frequent use.