Opened. Shows signs of use. The chain broke, so it has been replaced with a new one (the new chain is slightly longer than the original). Operation confirmed. It's old, but I think it's relatively clean, including the outer packaging. Please check the photos. ⚠️For the operation check, I removed the insulation sheet once to check the operation when listing the item, and then reinserted the insulation sheet. I have not replaced the batteries with new ones. Therefore, please understand and agree that there is a possibility of corrosion, leakage, or rust of the button battery during long-term storage before purchasing. There is a small dog in the house. Please refrain from purchasing if you are concerned or have allergies. There are no smokers.