This flying robot vacuum overcomes the Roomba's biggest weakness: stairs - The Verge
Stairs are no obstacle for flying robovac
iRobot - Cliff detection sensor helps #Roomba e5 to avoid falling down stairs and other dangerous drop-offs. Learn more about the Wi-Fi connected, Alexa integrated smart robotic vacuum cleaner: https://irobot .in/Introducing-Roomba-e5.aspx | Facebook