Twinbird Air Purifier AC-4311 Never used, it was forgotten in the back of a closet at home. Due to long-term storage, I've listed it as "Like New." I have opened it and confirmed that it works. This is a compact air purifier for a 4.5-tatami mat room. Please check the specifications in image 5. The outer box has some age-related stains, but to protect the product, I will use it as is for shipping. Please purchase if you understand and accept this.