i have had a pet port smart flap thingy for just over a year, our two younger cats use it fine but our older cats has only used it once to escape a big scary dog i may have brought into her house
which is weird as she used to use the original cat flap fine
you can turn the beep off if the cats dont like it
ours has worked fine for just over a year and has started to malfunction
called the customer service line today and they were very helpfull, sugested what i might neeed to do to fix it and if that dosent work they will either repair mine or send me a new one free of charge which i though was nice