USB-C to Dual DP Ports Adapter 2 in 1: For macOS: ONLY SUPPORTS MIRROR MODE-cannot extend to two independent displays due to system limitations.Windows OS supports full dual-screen extension (SST/MST modes). Connect device with USB Type C (tunderbolt 3) port to two external monitors with 4K DP output; You can enjoy movies, ultragames with your families on external HD big screen;if you are not sure how to setting, please contact us, or download the user guide in Product information->Product information 4K DisplayPort Output: This USB C to DisplayPort adapter supports resolutions up to 4K @120Hz for a single monitor, or dual monitors via DisplayPort MST technology (3840x2160@60Hz each). Also supports 1440p and 1080p @60Hz. High-performance design for smooth, delay-free gaming visuals. (Important: 4K output requires your source device, monitor, AND cable to support 4K resolution. Use a DP 1.4 or higher certified cable for best performance.) Plug and Play: Multi-stream transport offer