The fifth-generation LS also features 3D-surround Mark Levinson audio with in-ceiling array speakers. The next-generation, remote touch infotainment interface called Lexus Enform, is said to be designed to mimic smartphone operation, with support for handwritten input. Alongside the 12.3 inch navigation display, the fifth-generation LS can be specified with an optional 24 inch, colour HUD for the driver's view.[48] The fifth-generation LS was launched in Japan on December 18, 2017 and globally in the first quarter of 2018.