DURAGADGET Retractable USB Laptop NumPad Attachment for Dell Latitude D630 / Dell Inspiron 15 i15RVT-13287BLK 15.6-Inch Touchscreen Laptop (Black) Same size as a normal keypad with full size keys; makes entering numbers a breeze. No external power source necessary. No software required - Plug in and Play with windows. Retractable 65cm USB Cable so your wires won't get twisted and for extra carrying convenience. Comes with a 2 year warranty and our simple no quibble returns policy.