2.4G Wireles: 18 Keys keypad use advanced 2.4G wireless technology, plug and play, no additional drivers required. Signal mission stability, working range up to 33ft. Comfortable to Use: Ergonomically designed keyboard provides comfort which helps reduce strain. The great spring action and comfortable key sizes respond quickly, improving your work efficiency. Anti Slip: There are non slip mats on the back of the number keyboard, which prevents it from sliding around your desk. Portable: Powered by 1pc AAA battery, which is not included. Compact and easy to carry, great for those working on spreadsheets, accounting files or financial applications. Universal: Compatible with PC, laptop and desktop computers that have Windows 2000 / XP / Vista / 7 / 8 / 10 systems. Keys:18 Keys Power Supply:1 x AAA Batteries (Not included) Interface:USB 2.0 Colour:B:White/A:Black Material:ABS Package Contents: 1 * 2.4G Wireless Digital Keyboard Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.