Adaptor Charger Asus 19V 2.37A DC 4.0*1.35 mm for Asus X540 X540Y X540YA X540S X540SA X541 X541U X541UA X541SAdaptor Charger Asus 19V 2.37A DC 4.0*1.35 mm for Asus X540 X540Y X540YA X540S X540SA X541 X541U X541UA X541SAdaptor Charger Asus 19V 2.37A DC 4.0*1.35 mm for Asus X540 X540Y X540YA X540S X540SA X541 X541U X541UA X541S