Description: 2.4G Wireles: 18 Keys keypad use advanced 2.4G wireless technology, plug and play, no additional drivers required. Signal transmission 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. Specification: Material: Plastic Keys: 18 Keys Power Supply : 1 x AAA Batteries ( Not included ) Interface: USB 2.0 Size Chart: 9x13.6cm/3.54x5.35inch Package Includes: 1 Piece 18 Keys Wireless Numeric Keypad Note: 1.Please allow 1~3 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you.