The Adesso WKB6010UB 18-key wireless keypad is extremely compact and lightweight. Its wireless feature eliminates any unnecessary wires and keep your working station neat and organized. Quiet membrane key switches provide a quiet typing experience that last up to five million keystrokes. Perhaps the greatest feature that the WKB601UB has is that it is spill resistant. The structural design of the casing is meant for fluids to exit out of the unit in case of accidental spills. Next time when you accidently spill drinks while using your numeric kepad you can be assured those fluids will not trap inside the keypad causing damage to your device. Wired/Wireless: Wireless; Maximum Wireless Range: 33 ft; Connector/Port/Interface: USB; For Device Type: Laptop; Desktop.