FEATURES: Anti Backflow Device : To prevent milk contamination 3 Pumping Modes : Massage, Expression & Mixed modes for effective & efficient pumping 9 Levels Each Mode : 9 suction levels to choose from each mode Convenient For Double / Single Pumping : User has the flexibility to do single pumping or double pumping with extra comfort Mini and Portable : Compact to carry around at any point in time Quiet Pumping : Low noise to prevent from disturbing your baby's good sleep and allow you to discreetly pump wherever you are. Dual Power Source : Lithium-Ion battery or USB (Free power bank cable) Rechargeable Lithium-Ion Battery : Allow you to express anywhere conveniently with longer usage time Smart Memory Function : The machine has a memory function. Massage mode will operate up to a maximum of 2 minutes. After 2 minutes, It will automatically switch to expression / mixed mode depending on the last mode you were in before powering off in the previous pumping. 30 Minutes Auto Shut Off : The pump will automatically turn off after pumping for 30 minutes. You can restart the pump by pressing the ON/OFF button. Ultrasoft Silicone Massage Breast Shield : With comfortable massage bubbles design Silicone Shield Size : 24 mm X 2pcs (If you need smaller size shield for pumping, you can choose to use the 21mm silicone inserts provided) Touch Screen with LED Display : Allows you to see the modes and suction levels clearly on the touchscreen Detachable accessories : All accessories are detachable and easy to clean. Just take few seconds to assemble all parts BPA Free : All parts that touch breastmilk are BPA Free User Friendly : Easy to assemble, use and clean