Pool cleaning robot having an interface

A pool cleaning robot for cleaning a pool, comprising:

• a filtering unit for filtering fluid;
• a housing that at least partially surrounds the filtering unit;
• an impeller configured to induce fluid to pass through the filtering unit when rotated at a first direction;
• a pump motor for rotating the impeller;
• a drive system;
• first interfacing elements that are configured to interface with the pool during at least a part of a cleaning process of the pool;
• and
• at least one second interfacing element that extends outside a bottom of the housing without reaching a virtual plane defined by bottoms of at least two of the first interfacing elements;
• wherein a radius of each second interfacing element of the at least one second interfacing element is smaller than one fourth of a distance between the virtual plane and a center of the second interfacing element.