The idea was good and the unit is attractive but it took an inordinate amount of time to install the 9 volt battery.  It takes a small size Phillips screwdriver to open the compartment, an unnecessary precaution, and the screw started to strip.  The lead on the 9 volt battery connector is way too short and it will easily break - a real problem since it eats batteries.  It took me a half hour to install the battery, which is ridiculous.  It works for now, but the electronics will fail easily.  Set it up at the time you want to feed the cat because there is no way to adjust the hour,