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 Inspiron 14R N4110 N4120 M4110 N4050 N5040 N5050 M5040 M5050, VOSTRO 1440 1445 1450 1550 2420 2520 3350 3450 3460 3550 3555 3560