Easy to use, large display: All products with batteries have passed the test, be careful Please make sure to install the battery to use it. Install batteries to avoid unpredictable errors, ONE BATTERY for this product, 12 digits, better field of view, eye strain, upright LCD screen; automatic shutdown (not used for 10 minutes). Slip-resistant design: Slip-resistant tiles are not easy to slide during operation. Durable silicone button: good feel, ABS plastic material, light weight. Reasonable configuration and comfortable usage. Solar cell and battery dual power: Solar cells and backup batteries keep the desktop calculator running in dim light. The calculator can handle solar energy, 1.5V battery as battery backup and has automatic power supply. 100% After Sales Service: We offer a return policy to ensure you are 100% satisfied. If you have any questions about our product, don't hesitate to contact us, and we will give you a quick response.