Wireless numeric keyboard - Compact size with 18 keys - 2.4 GHz FSK technology - 34 pcs two-way RF channels - Range: Up to 10 m - Battery: 1x AAA - RF Bandwidth: 2 MHz - System Requirements: Windows 2000 / XP / ME / VISTA / 7/8 /10 - Dimensions: 82 x 124 x 22 mm - Weight: 70 g Missing the numeric keypad on your notebook keyboard? This numeric keypad is easy to connect via USB and allows you to use numbers and functions like a standard keyboard with an integrated numeric keypad.