SILENT: Revolutionary technology eliminates noise so that you can pump in peace - anytime, anywhere. Itâ€s in stealth mode so that you donâ€t have to be. WEARABLE: Small and lightweight, Elvie Pump is worn inside a standard nursing bra, making it truly hands-free. Nothing to tie you down - or slow you down. RESPONSIVE: Elvie Pump automatically switches from Stimulation into Expression mode when it detects let-down and will pause when the bottle is full. One less thing to think about. SMART: Connect to the free Elvie Pump app to monitor milk volume in real time, track pumping history for each breast and control the pump remotely.