Please take a look at the information! Casio VX-4 - Brand: Casio - Model Name: VX-4 - Language: CASL - Function: Programmable - Display: Large LCD - 8kb + 32kb The manual is unopened, and the box is still in use. Perfect as a collector's item! It's truly a work of art. There is some minor wear and tear, but it's truly beautiful. For those who love art, this is a bargain! A worthwhile investment! Thank you for your inquiry. It's a VX-4. Although it's a product from over 30 years ago, it's in good condition. The cover and side panels are also included. It works without any problems. Batteries are included, but they are for testing purposes, so we recommend replacing them. There are no errors. This VX-4 is in good condition. Serial Number: 226xx7 Perfect for those who like programming or want to learn. It uses the Z-80A architecture and can be programmed in C language or BASIC language. You can find many resources online that explain how to use it. You can connect it to a PC or laptop with a separately sold dedicated cable and transfer files. These cables are sold on Mercari for under 4,000 yen. Made in Japan, so you can rest assured! If you are not going to use it for a long time, please remove the batteries. 90% of the problems are caused by battery leakage due to deterioration. This product is also listed elsewhere, so it may be out of stock at the time of purchase. In that case, we will cancel the sale. We apologize for any inconvenience.