Self cleaning litter box

I have one - I had to set up a second litter box though and finally gave up on it - Every time it went off - my male cat ran and hid and REFUSED to use it - I think he might have gotten hit or something with it - even though it has a sensor because he started to use it when it was new - then became terrified of it.

My famale cat used it with no problems though - but she is a smart and non skittish cat so maybe that has something to do with it