H26 【Easy to Use】Utilizing 2.4 GHz wireless technology, plug and play, no device drivers required, fast data transfer, with almost no lag or dropout, and an operating range of up to 10M. [One USB port for connecting the number pad and mouse, mouse has space to store the USB receiver] 【Full-Size 20-Key Keypad Included】: The 20 full-size, concave key design is perfect for accounting files and financial application use. Includes a Tab key for comfortable input, allowing for efficient operation. 【Portable】The numeric keypad is ergonomically tilted to help prevent wrist strain. Suitable for spreadsheets, accounting documents, financial applications, and other staff. It can be put in a laptop bag or briefcase for efficient data entry wherever you are. Convenient for carrying and storage. 【Power-Saving Design】Sleep mode is automatically activated, eliminating the need for a power button and extending battery life. (AAA and AA batteries not included) 【Compatibility】Compatible with PCs and desktop computers with Windows XP/ Vista/ 7/ 8/ 10 operating systems and Mac systems.