2.4 GHz WIRELESS CONNECTION - Featuring advanced 2.4 GHz wireless technology, it's plug-and-play with no extra drivers needed. Enjoy stable signal transmission up to 33 feet. (The USB receiver is housed in the keyboard's battery compartment.) ERGONOMIC DESIGN - The integrated ergonomic tilt provides comfortable use and helps reduce strain. The responsive, large key actuation and comfortable key size improve your work efficiency, making it ideal for spreadsheets, accounting, or financial applications. NON-SLIP & PORTABLE DESIGN - Four anti-slip mats on the back of the numeric keypad prevent it from sliding around on your desk. This sturdy numeric keypad is easy to take with you, ensuring you can work quickly and confidently anywhere. ENERGY SAVING - It automatically powers off after 10 minutes of inactivity, effectively extending battery life. UNIVERSAL COMPATIBILITY - The TRELC wireless numeric keypad works with PCs, laptops, and desktops running Windows 2000/XP/Vista/7/8/10. Note: The wireless 18-key numeric keypad is not fully compatible with Mac OS.