Type-C USB3.1 cable is a minidp. Macbook plot is a minidp cable.

Type C to Mini Displayport DP USB Adapter C 3.1 Support 4K HDTV Converter Male to Female
For MacBook Projector-Type C Cable
Product Characteristics:
Type C for MINI DISB (MINI DPR) ECTS A HOST A FMALE TYPE A-C USB Port to a MONITOR or Projector with Mini Displayport Input. A Mini Displayport Cable is Required.
Easy to use: no Installation to Extended Drivers or Power Required. Compatible with 1080p.

this elegantly USB-C Aluminum Housing for Mini Displayport Adapter Blends with Your MacBook, with Slim and Portable Design loy
Size: About 160 * 22 * ​​12mm
Connector A: USB 3.1 Type C Male
Connector B: FMALE MINI DISPLAYPORT
Note!
1. This Adapter is Compaible with the Laptop Only, Will NOT Be Compatible with Smartphones, Tablets or Tablet PCS.
Your Laptop Should Support Displayport Alternate Mode (Alt Mode) VIA USB-C.
3. If The Product Dos Not Work, Please Connect The Adapter To Your Devices First, Restart Your Devices.
4. Remembering Warm: For Some Compatible Devices, This May Take a Few Seconds for the Data to Synchronize from The MONITOR, So please be patient. P / HDMI / VGA / DV) For this USB-C to Mini Displayport Adapter for a Second Signal Converter, We Can not Guarantee It Works Well.
6. This USB C to Mini DP Adapter is Not Compatible with the Monitor Radius interface. IT Can only Be Used for Mini Displayport to Mini Displayport Cable to Connect The Monitor. IT Can NOT Be Used for Mini Displayport to Displayport Cable / Adapter, Mini DisplayPort to HDM Cable / Adapter, Mini Displayport to DVI / Adapter or Mini Display Adapter to VGA COLLE / Adapter to CONITECT THE MONITOR. 8. Resolution Requires A 4K Equipped Power Supply, Mini Displayport Cable, and Output Display.