Asus X540L X540S X540 X540LA Keyboard US Black MP-13K93US-G50 0KNB0-610TUS00 US Version Asus X540 Series Asus X540L Series Asus X540LA Series Asus X540LA-SI30205P Asus X540LJ Series Asus X540S Series Asus X540SA Series Asus X540SA-SCL0205N Asus X540SC Series Asus R540 Series Asus R540LA Series Asus R540LA-RS31 Asus R540S Series Asus R540SA Series Asus R540SA-RS01 Asus R540SC Series Asus F540U X540L X540LA X540LJ X540S X540SA X540SC 90NB0B03-R30690 90NB0B11-R30110 90NB0B15-R30670 X540U X543U X543UA X543UB X543M X543MA X543N X543NA