Dell Inspiron 15 5000 A510160AU 15inch Laptop We test Inspiron laptop hinges to ensure they still feel tight, even after opening and closing the lid 20,000 times. Add beauty to your desk the moment you open your laptop, showing off the stylish, brushed hairline palm rest. And the backlit, bottom-mount keyboard makes typing more comfortable. We test commonly used keys for 10 million keystrokes and touch pad buttons 1 million times with no failure. So go ahead, finish your novel.