This is a portable oxygen concentrator (JAY-1) manufactured by LONFIAN SCITECH. I purchased it used a year ago for the care of my Chihuahua. I used it for about 3 months (approximately 85 hours) starting late last year. Including the previous owner's use, the total usage time is 102 hours (please refer to the digital display in the attached photo). According to the manual, this machine can be used for a maximum of 20,000 hours. This product is made in China, but after researching online, it has been used by animal hospitals (Paws Animal Hospital in Higashimurayama, Tokyo) and rental services. According to the manual, it can also be used by humans. The manual is only available in English and Chinese, but I will include a Google-translated document of the Chinese brochure. Other accessories are as shown in the attached photos. It seems to have a battery that can operate for 2 hours, but I used it while plugged into an outlet, so I haven't confirmed whether it works on battery power. In any case, this is a used item, so please consider purchasing it with that in mind. Please note that the cardboard packaging in the attached photos will be used as the shipping box. Also, I am selling a small animal oxygen cage (Hill Stone pet cage pt070m M size). If you purchase the oxygen cage as well, I will offer a 2,000 yen discount. Please consider it together.