CALCULATOR NUMERIC KEYPAD FUNCTION 1. 2.4GHz Wireless: This wireless numeric keypad uses 2.4GHz wireless technology, ensuring stable transmission without delay, plug and play. 2. Solar Panel: This calculator numeric keypad features a solar panel. Powered by solar energy, it functions as a basic calculator. 3. Ergonomic Design: This wireless numeric keypad has an ergonomic design for comfortable operation and portability. 4. 29 Keys: Equipped with 29 keys, this numeric keypad is suitable for use with laptops, ideal for schools, businesses, and general office tasks. 5. Switch Mode: Connect wirelessly to your computer and switch between keyboard mode and calculator mode using the PC/CAL key. Specification: Item Type: Calculator Numeric Keyboard Material: ABS Number of Keys: 29 Interface: USB Connection: 2.4G wireless Button Technology: X architecture Battery Type: 2 x AAA alkaline battery (battery not included) Compatibility: Universal Package List: 1 x Calculator Number Pad 1 x Receiver 1 x User Manual