Specifications: It is very small, cute and easy to carry. The fully transparent display makes it tasteful and very interesting. Since it is powered by solar energy, you can use this calculator whether you are indoors or outdoors, which is not only completely economical but also very convenient. Not only is it a ruler but alos is a calculator, and it also has a magnifying glass. It is a necessity for students. Item Name: Ruler Calculator Material: Plastic Power Supply: Solar Features: Transparent Display, Solar Powered, Ruler Shape,Cute Size: 13cm x 4.4cm x 0.36cm/5.12" x 1.73" x 0.14" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Ruler Calculator It is very small, cute and easy to carry. The fully transparent display makes it tasteful and very interesting. Since it is powered by solar energy, you can use this calculator whether you are indoors or outdoors, which is not only completely economical but also very convenient. Not only is it a ruler but alos is a calculator, and it also has a magnifying glass. It is a necessity for students.