Helect Calculator, Standard Function Desktop Calculator, Black School Office Calculator Calculator About this School Office Calculator : â€? Two-way Power School Office Calculator Calculator : Solar (works only when it is bright) and Battery (one AA battery NOT included). Note: â€? â€? Make sure one AA battery is inserted for continuous and accurate usage â€? Large 12-digit display School Office Calculator Calculator â€? Tax and Currency conversion, Function and Command Signs School Office Calculator Calculator â€? On and Off buttons, Profit margin %, +,-, Key Rollover School Office Calculator Calculator â€? Desktop School Office Calculator . School Office Calculator Dimensions LxWxH : 4.8 × 5.75 × 2.01 inches