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 PadMaterial: ABSNumber of Keys: 29Interface: USBConnection: 2.4G WirelessButton Technology: X ArchitectureBattery Type: 2 x AAA Alkaline Battery (Battery Not Included)Applicable Type: Universal.Package List:1 xCalculator Number Pad1 x Receiver1 x User Manual