Stop scooping cat litter, neutralize odours, and give your cat a clean litter bed every time with Litter-Robot 4, the highest-rated automatic litter box on the market. Elegantly designed to maximize comfort for kittens and large cats alike, Litter-Robot 4 features cutting-edge litter-sifting technology that separates your cat’s waste from the clean litter after each use. Reduce litter tracking, and monitor litter and waste levels in real-time with the Whisker app. Stay on top of your cat’s health with smart insights about your cat’s weight and litter tray usage.The entryway measures 15.75″ x 15.75″ and the power uses 15 Volt DC.