Say, "Alexa, turn on whisper mode," and the feature will be enabled. Otherwise, if you're not near your Amazon smart speaker, you can easily toggle on the feature through the Alexa app.

Whisper's chief innovation is its UltraQuiet WhisperDrive.It's an electric ducted fan.It's fairly small in diameter, and uses an unusually large number of strong, stiff blades, reinforced by a ...