The 8 digit calculator is perfect for classrooms. Features an extra-large display with 13mm digit size. Tamper proof plastic keys keep kids from tearing them off! Features basic calculator functions as well as a change sign key, square root key, percent key and 3-key memory. Kit includes 10 calculators in an eco-friendly wood caddy. Teacher’s kit also includes electronic educational materials that you can download and print only what you need for your lesson plans. Protective cover included. 2 year manufacturer warranty. Operates on hybrid power (solar/battery).