Mechanical Blue Keys: Professional mechanical blue keys, fast and accurate keystrokes, bringing a pleasant user experience. The touch of your fingers and the unique click sound are addictive. BEAUTIFUL RETRO AND ERGONOMIC DESIGN: Featuring simple lines and round keys in vintage typewriter style. The thick tube size is suitable for desktop and portable use. The large round key easily fits your hands and prevents fatigue. Ergonomic spring design, caring for your wrist. LCD screen: The screen adopts a 15 flip screen design to provide the best viewing angle and stability. Calculations and readings are convenient and comfortable. After 7 minutes of inactivity, it will automatically shut down to save energy. Gift design: Transparent packaging design, simple and elegant appearance, light pink highlights the high-end products of the calculator. QUALITY AND DURABILITY: High quality and durability achieved by using advanced ABS material. Note: The product does not contain batteries. The data are all measured manually. Due to differences in light and display, please allow an error of 1-3 cm. Please refer to the actual item received.