Luna Double Electric Breast Pump Kit, Sold As 4/Case Motif Aaa0013-20 Expression Mode: Works To Express Milk From The Breast As Efficiently As Possible Massage Mode: Helps Stimulate Let-Down By Mimicking A Baby'S Nursing Pattern Closed System: Backflow Protection Keeps The Motor And Tubing Clean, Preventing Contamination Battery-Powered Model Option: The Battery Model Features A Rechargeable Battery That Lasts 2+ Hours For Easy On-The-Go Pumping Lightweight: Just 2 Lbs. And Built Compact For Easy Mobility Quiet Motor: A Quiet 43-Decibel Hum That Won'T Wake Your Baby Pump, Breast Luna Dbl Elec W/Battery (4/Cs) Double Electric Breast Pump Kit Luna LunaSku: Mck-1196046_Cs Mfgr Sku: Aaa0013-201196046_CsShips In 2-7 Days