Quick overview from the supplier:
Adapter 3-in-1 Type-C to HDMI/USB/Type-C sockets, cable 75mm, Silver, Cablexpert A-CM-HDMIF-02-SV
Type-C port for charging (no data sync)
USB 3.0 data port: plug your flash-drive, camera or data sync your mobile phone
HDMI video output: connect your HDMI display (max. resolution 4K@30Hz)
https://cablexpert.com/item.aspx?id=11206
