This is the Seiko Kinetic 5J21-0A80. This Seiko Brightz series watch is equipped with a Kinetic Auto Relay automatic power-generating quartz movement. Condition: Tested and working. Time adjustment: Possible. Slight scratches, like-new condition. Please refer to the photos for details. Band size: Approximately 19cm (see images). Please note that there may be slight discrepancies between wrist size and watchband length. Thank you for your understanding. Features: ★★★ No battery replacement required. Shaking the watch generates electricity, stores it, and keeps time. ■Movement: Caliber 5J21 Kinetic Auto Relay automatic power-generating quartz. ■Auto Relay Function: The watch automatically stops if not used for a certain period of time. Simply shake it a few times to restore the correct time. ■Power Save Function: This function automatically or forcibly stops the watch to conserve electrical energy. The forced power save function can be manually set by using a special crown operation, without waiting for approximately three days of inactivity. ■Specifications: The stainless steel body is approximately 39mm in diameter and 9.9mm thick. It also has a date display function. ★★★Shipping Information: To ensure the highest quality, the product will be carefully packaged and shipped in a box. We generally ship via DHL. ※※Please note that customs duties may be incurred once the product arrives in your local area. Please be aware of this. ※※Regarding customs clearance, you may receive phone or email contact from your country's customs office or shipping company. Please make sure you are available to answer the phone. We sincerely hope that your product arrives safely and to your satisfaction. We appreciate your understanding and cooperation in ensuring a smooth transaction.