【Product Details】 The AURORA HC502D is a convenient calculator with basic calculation functions. It operates on both solar power and a button battery. It's a compact size, making it easy to carry around and fits easily in a pocket or bag. It can be used easily on the go. - Brand: AURORA - Model Number: HC502D - Colors: Black, Gray, Silver - Display: LCD - Size: Approximately 11.5cm x 7cm, less than 1cm thick 【Condition】Used only twice and then stored for about 10 years. As you can see in images 1-3, the black leather part has become wavy, possibly due to room temperature, so please be aware of this. Operation has been confirmed and there are no problems. No box or instruction manual. 【Note】 Please understand that this is a USED item that has been stored for a long time before purchasing. Solar/Built-in Battery/Calculator/Mini Calculator