USB C HUB, Upgraded TOTU 13 in 1 Type C Hub Dongle Adapter (4K Dual HDMIandDP,75W PD), Triple Display Docking Station for WindowsandMacbook Pro USB C Systems, macOS only Support Mirror Display

To use this product the host USB-C port from your device must support DisplayPort Alt Mode and Power Delivery
Use HDMI2.0/DP1.4 or above cables for optimum performance

USB 3.1 Type-C Overview
USB Type-C has a new feature called Alternate Modes which allows you to use non-USB connections with the USB-C cable and connection.Your device automatically uses the appropriate mode if it's supported

Display connection be limited

Make sure the device you're connecting to is supported and that you're using the right cable

DisplayPort connection might not work
Try using a different cable

Try these solution
Make sure your device and cable supports the same USB-C features as the TOTU docking station
Make sure the docking station is connected directly to your host device
Make sure the docking station is connected to the USB-C port on your host device that supports the correct Alternate Mode
For example if you're connecting a USB 3.1 Gen2Type C Alt Mode device make sure you connect to the USB-C port that supports Displayport alt mode and power delivery

Possible causes
The docking station you connected to has new features for USB-C that your host device or connect cable doesnt support
The docking station isn't connected to the correct USB-C port on your host device
The device is using an external hub or dock to connect to the docking station
Too many other Alternate Mode devices or dongles are connected to your host device

Audio/Mic Remind
Plug in this USB C Docking Station sometimes will change the default Audio output device to Docking Station which means your laptop speakers will not work anymore
To make your laptop speaker work please change in your laptop OS setting the audio output device back to laptop speakers

USB Accessories Disabled Solutions
If you experiencing the problem
Solution 1 Please unplug and re-plug
Solution 2 Reset the SMC of your device