Simple & Compact Design It comes with a hard sliding case to protect your keys while carrying it. Features a large 0.4 inch (10 mm) display with a 10 mm 3-digit numbers for easy reading. Convenient function for easy calculation. ■Statistical calculation. You will be asked for various types of measurements, such as average, standard deviation, mother standard deviation, etc. ■ N calculation. Can be converted and calculated to help with information processing. ■ Complex numbers calculation. Complex number decompression calculations. Approved for Land House Surveyor Tests. For quick input and quick response with a 2-key roll-over function that accepts input when you press the next key before releasing the key first. Plastic key top