The Littermaid Elite Mega LME9000 litter box has a sensor-activated ionic air cleaner which detects a cats exit from the unit and activates it. The ionic air cleaner operates until the rake cycle has ended. For night time use, the sleeper timer can be activated on the Elite Mega litter box to let the rake rest for 9 hours while the ionic air cleaner cycles on for 10 minutes every hour to freshen up the air. The pack includes the triple action tool for measuring litter depth and easy cleaning of rake. The Littermaid Elite Mega LME9000 has a detachable litter tray, paw cleaning ramp, extra waste receptacles and carbon filters. It operates on household current or 8 standard D cell batteries. Designed for extra-large cats or multiple-cat households, this litter box actually cleans itself, depositing waste into the disposable container, which seals away the waste and odors. When the container is full, just throw it away and replace with a fresh one (replacements sold separately). The litter box’s infrared sensor detects waste deposits and rakes them away 10 minutes after the cat leaves the litter box. If the cat re-enters and leaves the litter box before the initial 10 minutes have elapsed, the timer will automatically reset and delay the beginning of the cleaning cycle for an additional 10 minutes. The unit’s safety bar automatically stops the cleaning rake at the slightest touch, and its paw-cleaning ramp traps litter when the cat exits the box. The steel rake can be removed and the litter tray detaches for easy cleaning. Other highlights include an “on/off” switch and indicator light, a sleep timer for nighttime use, and a sensor-activated ionic air cleaner to minimize odors between cycles. Accessories include four easy-to-install carbon filters and four disposable, sealable, waste receptacles for a virtually odor-free environment. The unit’s quiet motor uses a low-voltage AC adapter (included) or batteries (8 standard “AA” batteries, which are not included). The litter box measures 28 by 20 by 8-1/2 inches. Product Description Litter pan size: Elite Mega. Waster receptacles: 4. Carbon filters: 4. Ramp. Ionic air cleaner. Sleep timer. Removable rake. Scoop. AC adaptor. Operates with batteries. Unit color: white. Accents: blue.