Features: brand new and high quality Bluetooth-compatible technology provides a cable-free & clutter-free connection, very stable and reliable, no device drivers needed, no delays and dropouts, fast data transmission, operating distance 10m（Note: No USB Adapter Needed). Full-size 22 keys, comfortable typing precise control, good resilience fast response and reduce the press sound, Give Quiet Office Operation & Long-Life. Numeric Keypad supports （），= , Tab, Delete etc. Integrated ergonomic tilt provides for extra comfort that helps reduce strain, great for those working on spreadsheets, accounting files or financial applications. for Windows 98SE /ME /2000 /XP /Vista /7/10, for Mac OS X 10.6 & higher, Linux 2.4 or above operating systems. Numeric keypad is not fully for Mac system (Function keys do not work, while number keys part works fine). Specifications: Keys Number: 22 for key Material: ABS Colour: black, green, pink, white Size: approx. 131.5x88.8x19.72mm/5.18x3.5x0.78in Package Includes: 1PC x Numeric Keypad note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!