YES.The adapter is compatible with Samsung Galaxy S9/S9+, S8/S8+, and Note 8, which can mirror the phone screen to the monitor or TV. For some other smartphones, we recommend checking the official website for compatibility first
Well, you have to make sure your laptop can supply audio &video through the USB C port first. And then check out whether your laptop would support up to 4K@30Hz or not. However, if your computer supports 4K@30Hz, while your monitor/TV only supports 1080p, you can only output 1080p rather than 4K@30Hz. Like 2015 MacBook 12 inch has a maximum output of 4K@30Hz. Please email support@tuwejia-link.com if you still not sure about the compatibility
Most smartphones DOES NOT support, except for Samsung S8/S9, HTC U11, and few others. We would recommend checking the specs of your smartphone or tablet first. If it supports Video Out through USB-C/Type-C, then YES

Hey Dear, you may try the following steps to see if it helps:

  1. Check if you plug into the right USB C port (the one with USB 3.1 Gen 1);
  2. Check if the display needs to change the input source manually;
  3. Check if your device needs to upload the driver. (USB port);
  4. Check if the HDMI to HDMI cable works in good conditions. If the problem remains, please email support@tuwejia-link.com for more solutions.