If you"ve ever spent time entering numbers into spreadsheets using your laptop, you will know that its very time-consuming indeed. This USB number pad gives you the functionality you need when you"re using your laptop and number-crunching.Features:Same size as a normal keypad with full size keysLong USB leadMakes inputting numbers a breezeNo external power source necessaryNo software requiredWe"re so confidedent in the quality of this product that it comes with a 2 year warranty and our simple no quibble returns policy.Compatible with: Dell Inspiron 15