Deebot N79S and 500 robots are very similar in many respects. Nevertheless, there`re a couple of distinguishing features. The first is a dustbin capacity. The 500 model has a little bit bigger dust collector for 520 ml of debris, while the N79S is equipped with a 450 ml bin (though the manufacturer states it`s big enough for 520 ml either). The second difference is their weight, for Deebot N79S with its 7.05 lb is heavier than the 500 with its 4.4 lb. And the final difference is the presence of Smart Motion guidance in Auto mode of Deebot N79S vacuum. While searching for the same feature in Deebot 500, we found no info.