Increase your data-entry productivity with the 18-Key Wireless Numeric Keypad from Adesso. Connect wirelessly at 2.4 GHz by plugging in the nano USB receiver. The membrane key switches are low noise and rated to last up to five million keystrokes. Its compact and lightweight design makes it portable and saves plenty of space on a desk. The keypad's spill-resistant design prevents liquids and accidental spills from damaging the device. Built-in auto sleep maximizes battery life by saving power when the keypad is not in use. Plug and play means no software downloads are necessary for operation. This keypad is compatible with Windows devices.