The Adesso AKB-601UB spill-resistant 18-key keypad is the keypad that you deserve to have for many reason. To begin with, it is extremely compact and lightweight which makes it extremely portable. Its membrane key switch also provides a quiet typing experience that lasts up to five million keystrokes. Perhaps the greatest feature that the AKB-601UB 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 be trapped inside the keypad causing damage to your device.