CASIO MW-10A, a dual-power basic calculator. - Brand: CASIO - Model: MW-10A - Power Source: Dual power (solar/battery) - Key Arrangement: Standard key arrangement - Functions: Basic calculation functions I have stored this calculator with almost no use. It is in beautiful condition. Please check the condition in the images. ◆ Although it is dual-powered, it only works when exposed to sunlight. I'm not sure of the details, but the lithium battery may be dead. ◆ I cannot provide support for malfunctions after purchase. Please understand the above before purchasing. Returns and refunds are not accepted after purchase.