The Samsung Galaxy Tab S4 10.5 brings major improvements to DeX - the PC-like mode that Samsung added to Android. The tablet is also a relatively rare higher end offering with a 10.5" Super AMOLED screen and a Snapdragon 835 chipset. DeX mode can be enabled without connecting the tablet to a dock. This means apps will launch in resizable windows that you can drag around. This tablet is also the first to support two screens - both the tablet's screen and the external monitor (connected over HDMI) are available. Older DeX implementations disabled the phone's screen. Speaking of, the...
Source: https://www.gsmarena.com/samsung_galaxy_tab_s4_105_is_first_tablet_with_dex_comes_bundled_with_an_s_pen-news-32541.php
