The CASIO XD-W730 is a folding electronic dictionary equipped with a QWERTY keyboard. - Brand: CASIO - Keyboard Type: QWERTY - Screen Size: Folding Thank you for viewing. Even with batteries inserted, it does not power on. It can be used with USB power. It has been disassembled once. At that time, I checked if other functions were working. I suspect a defect in the main board? The area next to the delete key is cracked (photo 4). If you are someone who repairs these, or if you are someone who would use it with USB power, please consider it.