Received item, did not work properly.  Called LitterMaid and they told me to return to seller.  For the benefit of the doubt I had them send me another one.  Dealing with Amazon was very helpful and they were nice to me.  I received the replacement, and it would not shut off..back it went for a full refund.  I have owned a Littermaid in the past and it worked OK so I thought I would try again.....BAD EXPERIENCE.