had been the case with NTG1 (an audio gateway including the radio, amplifier, and MOST controller; a head unit with display; and a navigation processor) and thereby also simplifying the wiring. However, unlike NTG1 models, the NTG2 COMAND was unable to play MP3 discs. To use the navigation at the same time as listening to an audio disc requires the optional CD changer. This version of COMAND was used in various models such as the W203 C-Class and the W209 CLK and even the Vito/Viano. It was also fitted to the Smart Forfour. COMAND-APS NTG3/NTG3.5 Intended for the flagship W221 S-Class and the W216 CL-Class, COMAND NTG3 is a high-end system. Unlike for most other Mercedes-Benz cars, the S-Class and CL-Class from now on have COMAND as standard, allowing even better integration and for COMAND to operate even more vehicle functions. The navigation maps are stored on an internal hard disk instead of a DVD disc (although updates are installed from an update DVD). In addition to operating the audio, video, navigation and telecommunication systems, the NTG3 COMAND also controls a host of other features, such as the multi-contour and drive-dynamic seats, the HVAC system, the rear window shade, the vehicle locking, alarm and immobiliser, interior and exterior lighting functions, the optional ambient lighting feature, easy entry/exit settings, etc. The NTG3 system comes with a large, high resolution 8" TFT 16:9 widescreen colour COMAND display mounted higher and more directly into the driver's line of sight and with a separate, large rotary controller mounted on the centre console in between the front seats. This system was the first COMAND to support DAB radio on the MOST bus. NTG3 uses an in-dash DVD (and CD) changer and CompactFlash reader for MP3 music. A digital TV tuner and a Harman Kardon Logic7 stereo sound system with 14 speakers and a 600W 13-channel DSP amplifier can be optionally installed and controlled via COMAND. Where a factory fitted rear seat entertainment package is installed, this can use the NTG3 digital TV tuner and the surround sound system for playing out its audio over the speakers instead of headphones. As with previous models, Linguatronic voice command and control is available as an option too. The main controller for NTG3 is a large rotary dial with haptic feedback, although there are also buttons for quick access to commonly used functions and even a "favourite" button that