Techno AO is an item said to reduce the effects of electromagnetic waves emitted from smartphones, computers, etc. It's a stick-on type and requires no batteries or charging. I believe it's in good condition. The purchase date is unknown, but it likely exceeds the 2-year expiration date. Please purchase only if you understand that this item has been stored at home by a non-professional. Will ship via Rakuraku Mercari Bin or Yuuyu Mercari Bin.