P2415Q 24" Widescreen 4K 3840 x 2160 at 60Hz, 4 x USB 3.0 downstream (Type A), USB 3.0 upstream (Type B), HDMI, Display Port, Mini Display Port, Display Port output (MST), Audio Line-Out( Mini Jack )
P2419H 24" Widescreen , Resolution 1920 x 1080 , 1 x DP (ver 1.2), 1 x HDMI (ver 1.4), 1 x VGA, 1 x USB 3.0 port - Upstream, 2 x USB 3.0 ports - Side, 2 x USB 2.0 ports - Bottom
U2419H 24" Widescreen , Resolution 1920 x 1080 , DP connector (include DP in and DP out) , mDP connector , HDMI (MHL) connector USB 3.0 Hi-Speed Hub (with 1 USB upstream port and 4 USB downstream ports)