This item is a Casio old digital watch. B815. Module 155. The battery has been replaced and the watch has been checked for functionality at a watch store, so it can be used normally. The body and belt have been cleaned. The belt is a genuine Casio belt. It's a simple and cool watch. This is a popular Casio old digital wristwatch both overseas and domestically. The wrist size is currently about 18.5 cm. The belt buckle holes allow for 5 holes to be made larger. Also, the wrist size can be further adjusted smaller by removing links. Please refrain from purchasing if you are nervous about used items. Please be sure to check the self-introduction section. We have many other items for sale, so please take a look. Also, we do not accept cancellations after purchase, so please be aware of this.