USB 3.0 port: USB 3.1 gen 1 standard up to 10Gb/s, realizing data transfer, OTG function, can connect USB flash drive, mouse, keyboard, portable hard drive, card reader and other accessories HDMI port: realizes display output function, supports mirroring and expansion modes, with a maximum resolution of 4K, compatible with 2K, 1080P, 720P, etc PD port: connected to a charger for charging function, up to 100W, without data transmission function Compatibility: The three in one adapter can help USB C port devices (compatible with Thunderbolt 3 and 4) achieve data transfer, OTG, charging, and video output functions Incompatible: If the USB C port of the device does not have display function, the HDMI port of the adapter will not work. For example, on Galaxy A series phones, the HDMI port of the adapter does not work, but the charging port and data transfer port can work