With a footprint of 22 inches wide by 27 inches deep and 29.5 inches high, the Litter-Robot 4 is slightly slimmer than the Litter-Robot 3. A suburban area at night is about 40 dB, and the hum of a refrigerator is about 55 dB. For the sake of comparison, the sound of a whisper clocks in at about 25 dB. A difference of 15 dB is significant when you live in a small space or if, like me, you plan to keep the litter box in a bedroom. ![]() It's significantly quieter than the Litter-Robot 3 (48.7 dB) and our dust-free recommendation, CatGenie AI (51.4 dB). This box has a very quiet cycle of about 33 decibels (dB). The larger, odor-reducing waste drawer requires less frequent emptying. The third generation machine can recognize cats weighing 5 pounds or more, but the Litter-Robot 4's laser sensing system can recognize cats weighing at least 3 pounds. The Litter-Robot 4 improves on the brand's previous generations with an upgraded laser sensing system and an extra-large waste drawer with odor-locking technology. You can use the waste bin with or without a liner. The box is available in white or black, and I have it in both colors (both provided as review samples by the brand). Plus, its smart features can help you monitor your cat's well-being. It cycles quietly and is thoughtfully designed for cats of all sizes and needs with a spacious interior for large cats and optional steps for mobility-impaired felines. The Litter-Robot 4 also has the best safety features of the automatic litter boxes I've tested. It automatically disposes of cat waste, sparing me from having to see or smell it and keeping my cats from stepping in it later. Sure, $699 is a lot to spend on a litter box, but this machine gets the job done. ![]() ![]() For weeks, I took notes as my cats circled, dug, and did their business, and in the end, I selected Litter-Robot 4 as the best overall self-cleaning box. In addition to using the Whisker Litter-Robot 4 since 2022, I have also tested nine other best self-cleaning litter boxes. When Whisker sent me the new Litter-Robot 4 to test in 2022, I was eager to see if the newest generation was worth the investment. In fact, I've used both the Litter-Robots 2 and 3 to reduce the time I spend cleaning and improve litter box cleanliness for my cats. I love my cats, but I don't love scooping their litter boxes. Shop at Whisker Litter Robot External link Arrow An arrow icon, indicating this redirects the user." Shop at Chewy External link Arrow An arrow icon, indicating this redirects the user."
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