Silicon Motion Audio and Video Adapter PETUH201-B USB3.0 (USB-A or USB-C) to Dual HDMI™ Video Graphics Adapter Supports 4K@30Hz + 1080P@60Hz for Windows and Mac OS, Switch On/Off function PETUH401-B USB3.0/USB-C™ to 2xHDMI 1080p+2x4K@30Hz adapter with Two Key (Each Control Two HDMI Port Screen On/off) On/off Screen Function Supports Mac OS and Windows MST PETUH201 USB3.0 (USB-A or USB-C) to Dual HDMI™ Video Graphics Adapter Supports 4K@30Hz+1080P@60Hz for Windows and Mac OS PETUH201-A USB3.0 (USB-A or USB-C) to Dual HDMI™ Video Graphics Adapter Supports 4K@30Hz+1080P@60Hz for Windows and Mac OS