Feature: 1. 2.4GHz Wireless: This wireless number pad adopts 2.4GHz wireless technology that ensures stable transmission without delay, plug and play. 2. Solar Panel: This calculator number pad has solar panel. When powered by solar energy, this number pad can only be used as simple calculator. 3. Ergonomic Design: This wireless number pad features ergonomic design that ensures comfortable control, easy to carry. 4. 29 Keys: This wireless number pad possesses 29 keys, suitable for laptops, banks, schools, companies, etc. 5. Mode Switch: When using a wireless connection to the computer, you can use keyboard mode and calculator mode, and use the PC/CAL key to switch. Specification: Item Type: Calculator Number Pad 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) Applicable Type: Universal. Package List: 1 x Calculator Number Pad1 x Receiver1 x User Manual