The Litter-Robot Open-Air, Self-Cleaning Automatic Cat Litter Box makes cat ownership easier every day for pet parents. It sifts clumps and waste out of the litter 3-7 minutes after a cat leaves and drops the waste in to a receptacle drawer for easy disposal. The new Litter-Robot Open-Air model is the first major update to the highly successful and desired Litter-Robot platform. This model is a culmination of the latest technology and customer feedback received over the last 15 years. The patented sifting process cleans litter automatically after each use and deposits waste in a large-capacity waste drawer. A drawer full indicator light will notify you when the waste drawer is full so you never have to guess when to empty your Litter-Robot. The larger, more ergonomic cat entry and litter chamber along with the new self-adjusting cat sensor accommodates cats weighing 5lbs or more. There is also an automatic night light that provides lighting for elderly cats during night time visits to the litter box. Other new features include control panel lockout, variable wait time setting, 8 hour sleep mode, and a battery backup option. The Litter-Robot Open-Air comes with a 90 day money back guarantee and a full 18 month warranty. With more than 110,000 customers, 15 years in business and 3 versions of the Litter-Robot, we have developed the solution for pet parents to never have to scoop again!