Thank you for viewing. MUJI Tag Tool "Security Buzzer" Brand new, unused, unopened. This product is no longer sold at MUJI. The batteries that were originally included will be sent as is. One out of the four has been tested and confirmed to be working without any issues. It's more simple than character-themed ones, so you can use it for a long time. We recommend incorporating a stylish item to protect your child's safety. ● Sold only as a set of 4. Please refrain from purchasing individual units.