If you read my review of the Winbot, you know that I have floor to ceiling windows. I bought this extra cord to be sure the Winbot would not have any trouble reaching the tops with only the cord that came with it -- because the electrical outlets aren't always right by the window. The original and he extra cords have easy couplings ensuring that they don't come apart. The Winbot has strong suction and had no trouble pulling both cords.