This USB-C to HDMI Adapter (DP Altmode) allows you to connect an extra monitor with HDMI port to your new Macbook or Chromebook. You can watch videos or slideshows together on the big screen. Features Supports USB-C input and HDMI output Supports DisplayPort 1.2 Altmode Supports per lane data rates of 2.7Gbps (HBR) and 1.62Gbps (RBR) Supports HDMI resolution max up to 4KX2K@30Hz USB bus power (no external power supply) What's in the box USB 3.1 Type-C to HDMI Adapter