According to tuvie ”It features a special IPS system attached to the user’s shoes and acts based on the user’s movements. When the user taps his/her shoes, TAP recognizes the signal and moves towards the messy area to clean the same. Two or more taps will direct the robot to cancel the order. The mechanism is relatively simple and it is as entertaining as tap dancing. As one of 8 Electrolux Design Lab finalists, Robo TAP Cleaner proves to be an excellent alternative to traditional vacuum cleaner”.
Source : tuvie