Before you buy this item, in order to avoid some unneceary troubles,you must read those tips at first . Please note:Please make sure your device is compatible with the extension, otherwise it cannot be used. The Type-C interface of the laptop must be Thunderbolt 3 or support the USB3.1 protocol.HDMI function requires Type-C interface to support Display modeThere are 3 models available, please choose suitable model according to your needs: ---12 in 1 Interface included --- Gigabit Ethernet Lan RJ45*1 (10/100/1000Mbps Broadband)VGA*14K / 30HZ HDMI*2USB 3.0*2 (high-speed data transmiion, flash disk/mouse/keyboard and so on)USB 2.0TF Card Reader*1SD Card Reader*13.5mm Audio Jack/Mic 0-in-1*1USB C PD charging*1USB C data port*1 ---8 in 1 Interface included --- 4K (3840*2160 / 30HZ) HDMI*1 Ethernet Lan RJ45*1 (10/100Mbps Broadband) USB 3.0*2 TF Card Reader*1 SD Card Reader*1USB C PD charging*1USB C data port*1 ---6 in 1 Interface included --- 4K / 30HZ HDMI*1 USB 3.0*2 TF Card Reader*1 SD Card Reader*1USB C PD charging*1 IMPORTANT NOTE1. Make sure that the host USB-C port on the device complies with the USB 3.1 specification or the USB-C port is Thunderbolt 3.2. To use the HDMI output port, the host USB-C port from your device must support DisplayPort Alt Mode.3. 3.5mm Audio needs to be used with HDMI or VGA.4.Some computer systems need to manually install the network card driver to connect to the Internet5. To use the Power