No, the Litter-Robot will not eliminate all litter box odour. However, because waste is promptly removed and contained in the base, typical litter box odour will be reduced significantly. Additionally, a large carbon filter located in the front of the waste drawer absorbs odours and moisture to discourage mould growth (a major culprit of that telltale litter box smell). The amount of odour control the Litter-Robot will provide depends on the amount of odour created—by how many cats use it, what type of litter you use, and your cats’ diets, among other things.
Of course, the more often you empty the waste drawer, the less opportunity there is for odour to escape. That said, if you empty the waste drawer and notice the Litter-Robot is still a source of unpleasant odours, we recommend changing out the bed of litter completely, deep cleaning the Litter-Robot twice per year, and replacing the carbon filter and seal strips as needed (available here).
It is also worth noting that scented litters are generally not as effective at absorbing odors as unscented litter. Instead, we recommend an unscented, odour-trapping, natural litter like Cat Evolution Premium Clumping Litter.