When functioning properly, this is a great product, however and unfortunately, the Litter Maids have mechanical/electrical flaws.  Over the past 4 to 5 years, I have bought several Litter Maids (have several Kitties) and five of the units have failed.  Of the last two I purchased (within the last 4 weeks) one of these has already failed.  The rake will not go into park...will not stop.  Thus the unit is of no use. These units have been on the market for several years.  Surely they could have made the necessary quality improvements by now.  Don Johnson