DisplayPort to Dual HDMI AdapterDisplayPort to Dual HDMI Adapter can output one DP signal to 2 HDMI displays at the same time, which can support the use of Extended Mode and Mirroring Mode (AAA/ABB/ABC) to meet your need for Multi-screen displays (only unidirectionally transmit from one DP signal source to two HDMI displays). Mac OS only supports SST mode (AAA/ABB). Mirror & Extended DispalySupports two display modes, for DP 1.2/1.4 desktop/notebook/graphics card (Windows supports MST), two monitors can be set to extended or mirrored display, the monitors can display the same image or different images; for Mac OS, due to its own limitations can only support the mirror mode, the monitors can only display the same image. Note:If the image fails to display, please set the resolution to 720p or 1080p.