Product Description: This is Casio's slim and lightweight calculator "SL-300". It's a long-selling model with a simple, somewhat retro design not found in current products. Power Source: Solar-powered (no internal battery required). It can be used immediately with light, and you don't have to worry about the battery running out. Condition: Used. Operation has been confirmed in a bright place (see images). Appearance: There are scratches and scuffs from use, but the LCD screen displays clearly, and the buttons respond well. Accessories: Dedicated notebook-style protective case. It's card-sized and very thin, making it ideal for carrying in a chest pocket or notebook. Shipping: Shipping included. Will be shipped with waterproof packaging. Instant purchase is welcome. Thank you.