Litter-Robot® 4 Automatic Self-Cleaning Cat Litter Box by Whisker. Revolutionize your cat care routine with the Litter-Robot® 4 Automatic Self-Cleaning Cat Litter Box by Whisker, the ultimate solution for hands-free maintenance that eliminates scooping forever. This elegantly designed unit, measuring 22" x 27" x 29.5" and weighing 24 lb, features advanced litter-sifting technology and a spacious, MultiCat design to ensure comfort for cats of all sizes and is suitable for up to 4 cats. Key benefits include drastically reduced odors and minimized litter tracking thanks to the included fence and step, plus the convenience of the Whisker app for real-time monitoring of litter and waste levels right from your phone. The Litter-Robot 4 arrives complete with 3 drawer liners, a Carbon Filter, the Fence, and the Step, giving you everything needed to immediately provide your cat with a clean bed of litter every single time.