ViewSonic’s IFP6570 and IFP8670 USB Type-C port supports the below specifications:

1. DP alt mode: supported with DP1.4 (4K@60hz)

2. Power delivery specification: 60W (5V3A、9V3A、12V3A、15V3A、20V3A)

3. USB data transfer rate specification: USB 2.0 (480 Mbps)

Note: USB Type-C refers to the connector type, not the capability of the port itself. For example, video over USB Type-C requires the hardware source to support specific USB-C alt mode protocols.

As of  Sep 8, 2020  with USB Type-C FW version 0364, below are USB-C verified compatible devices.

USB-C Tested Compatibility List
Acer Chromebook CP311
Dell Inspiron 5000
MacBook Pro (2018)
MacBook Pro (2017)
Surface Go
HP Chromebook 14
HP EliteBook 1050 G1
HP EliteBook 840G
Huawei Matebook X Pro
Lenovo X280
Samsung NP930XBE
Samsung Pro-2
Surface Book 2

Note: Please verify USB Type-C port capability with the device manufacturer, and make sure to use the USB Type-C cable in the IFP70 accessory box.