The Bakker Elkhuizen S-board 840 Design Numeric Keypad is the perfect companion to the S-Board 840. Features include a super-slim design and low-force shear mechanism switches to provide a comfortable, portable option for users looking to add a USB numeric keypad to their ergonomic keyboards. The S-board 840 Design Numeric Keypad also has a unique calculator function that allows for simple calculations to be made right on the built-in LCD screen. These calculations can then be transmitted to your computer quickly and easily.