21-key numeric keypad Industry leading scissor switch keys Dedicated productivity keys (Calculator, Tab, Equal, Esc keys) Minimalist design with ultra slim profile at 13 mm Rechargeable , up to 3 months use in single charge (may vary based on usage) Supports Lenovo Unified Pairing Receiver Go beyond the limitations of your notebook and complement your workflow with a tactile, responsive 21-key keypad that sports premium scissor-switch keys and is compact enough to take on the go. With an impressive up to 3 months of battery life and a powerful 2.4 GHz wireless connector, you can rest easy knowing that your numeric keypad will be ready for action whenever you are. Features Frequency band 2.4 GHz Keys operating life 10 million characters Keyboard number of keys 21 USB hub No Pointing device No Purpose Universal Key switch type Tactile Device interface RF Wireless Design Product colour Grey Ergonomic design Yes Power Power source type Battery System requirements Windows operating systems