As a human, the design and usability are great, but since my cat is big, it doesn't get much use, so I'm putting it up for sale. It has been washed, but it's not unused, so please refrain from purchasing if you are concerned. There were originally two deodorizing filters included, and for this listing, the bag has been opened and there is only one filter. Suggested retail price: ¥12,000 Shipping costs will apply, so please refrain from unreasonable price reductions.