The silicone-polymer valve can be flipped between open and closed positions with a pulse of radio waves. A set of conducting "fingers" on the valve act as antennae and convert the signal's energy into sound waves that travel through the polymer and create stresses inside the device.
To secure the device against accidental activation, the device works in a similar way to a car's remote key-fob. Each valve responds only to a radio-frequency signal with a unique code.
A Fob for the ol' Knob?
Sure, it's all a medical marvel until the neighbor opens the garage door and the next thing you know you have twins.