☆ With case ★ A faint name written with a permanent marker remains on the back. If you don't mind this, I would appreciate it if you would consider purchasing. ★ There are no noticeable stains, but I think there is some feeling of use. AZ-26S study calculator with eco-battery. - Model: AZ-26S - Power type: Eco-battery - Accessories: Case - Display method: LCD - Functions: Study calculation Thank you for viewing.