CITIZEN PROMASTER Eco-Drive AIR DIVER'S ・Model Number: 7877-H04155TA It sometimes works and sometimes doesn't. m(_ _)m I'm not familiar with watches, so I don't know the details. m(_ _)m Therefore, this is being sold as a junk item. Please purchase only if you understand. Please understand that this is a junk item and is non-refundable, non-returnable, and non-exchangeable (3N). Shipping is planned via Yu-Packet Post Mini.