Electronic calculator in a plastic case with 8-digits LCD display with acrylic cover. Has a memory key. Optimal set of calculating functions allows to perform basic mathematical operations, calculate percentages, extract the square root and memorize the intermediate result. Solar power element can be charged both from direct sunlight and office ceiling lights, helping to save a charge of an alkaline battery. Power supply of a calculator turns off automatically if the device is not used for 7 minutes.