This year, a cat that was given away wouldn't come out from under the washing machine, so I had to buy this. I've only used it once indoors. Please refrain from purchasing if you are sensitive to used items m(_ _)m The size is a standard S size. It has a mechanism that closes when the cat steps on the platform after food is placed inside. For those with lost cats, or volunteers, how about it? Outer box size: Small animal trap S size Outer box size: 70 x 21 x 5 Retail price: 2,980 yen Used only once indoors With box, no instructions Please be sure to read the profile m(_ _)m Thank you.