Basic by LOCOCK. Details:Note:1. If the goods you receive have this problem, you can self-assemble the keys. 2. There is a protective film on the display screen that is not really scratched. You can keep it or tear it off This is a unique calculator for you that has elegant design, stylish and personalized color. It can bring the user pleasant experience by fast and precise key presses because of 20 Professional mechanical Blue switches working in it. It’s not just a calculator achieve daily use but also as a decoration on the table . The calculator will be off in 7 minutes without any operation. Specification: One #7 AAA battery is needed. Material:Fireproof ABS+PP Weight:226(g) Size:5.6*3.9*1.