I purchased this milk warmer last year and used it about 10 times. It comes with the box and instruction manual, but the manual is in English and Chinese, which I couldn't read. As of August 14th, the same product appears to be selling for around 3,800 yen on Amazon. This product was convenient because it can be used wirelessly when charged. Many similar products require a cord, so this one is easier to use when you're out and about. Price is not negotiable. Thank you.