Pay Attention: If some keys will don't work after installed ,this is not because keyboard is broken ,the most posiibility is ribbon cable don't connect well with your laptop ,pls try to reconnect more times .Many customers solve this problem after did this. We tested every keyboard before shipping ,please be assured the purchase. thanks Backlit : No Color : Black Layout : US keyboard layout Status : Brand new Compatible Models: for Dell Latutude E6400 E6410 E6500 E6510 E5410 E5510 E5400 E5500 Precision M2400 M4400 M4500(Without Pointing)